Sciatica and hamstring stretching: possible nerve tension
24/10/2026
IN BRIEF
| L5-S1 foraminal compression is a narrowing of the opening where a nerve root exits, which can cause sciatica with pain, tingling, or weakness in the buttock and leg. In Montreal, an assessment allows for correlating symptoms, clinical examination, and imaging to guide management options. An appropriate conservative approach can help relieve symptoms and maintain progressive activity; significant or worsening weakness requires prompt medical advice. |
In Montreal, sciatica related to L5-S1 foraminal compression can cause pain that starts from the lower back or buttock and radiates behind the thigh down to the calf or foot. The foramen is the opening through which a nerve root exits the spine; its narrowing can irritate this root, especially in the presence of disc wear or arthritis.
The diagnosis relies on evaluating symptoms, strength, sensitivity, and reflexes. An abnormality on MRI must correspond with observed signs: imaging alone does not determine the cause of pain. Based on the evaluation, non-surgical management may include gradual resumption of activities and tailored exercises.
Consult urgently in case of loss of bladder or bowel control, numbness in the perineum, or significant or progressive weakness of the leg. This summary is informative and does not replace a consultation with a healthcare professional.
A L5-S1 foraminal compression refers to a narrowing of the opening located between the L5 and S1 vertebrae, where a nerve root exits the spine. It can irritate a root and cause pain in the buttock or leg. The path of symptoms, clinical examination, and imaging must be interpreted together: a visible abnormality on MRI does not alone prove that it is causing the pain. Foramina are small passages located on each side of the spine. Each passage allows a nerve root to exit towards the pelvis and leg. At the L5-S1 level, a reduction in space can irritate the root exiting at this level. The term foraminal stenosis refers to this narrowing. Foraminal compression does not automatically mean that the entire sciatic nerve is pinched. The sciatic nerve forms lower down, from several nerve roots. However, irritation of a lumbar root can cause sciatalgia, meaning pain that radiates from the buttock down the leg. At L5-S1, it is important to distinguish the L5 root, which exits through the foramen, from the S1 root, which passes lower down in the canal before exiting the spine. Foraminal stenosis at this level generally concerns the L5 root. A disc herniation or narrowing of the lateral recess may irritate the S1 root instead. Imaging and examination help clarify the mechanism. Several changes can decrease the space around the root. The disc may lose height over time. Bone spurs related to arthritis can reduce the opening. A disc protrusion, thickening of surrounding tissues, or vertebral slipping can also contribute to narrowing. A L5-S1 disc herniation and foraminal stenosis are two distinct problems, even though they can coexist. A herniation can irritate a root by its position and inflammation. Foraminal stenosis instead describes a lack of space in the nerve exit passage. To learn more about possible images, consult our article on what MRI can show in the case of disc herniation and sciatica. The stenosis can develop gradually and symptoms may vary depending on positions or activities. Pain that worsens while standing or walking can guide the assessment, but this sign alone is not sufficient to establish a diagnosis. The page of the TAGMED Clinic on L5-S1 foraminal stenosis provides more insights on this condition. Irritation of the L5 root can produce pain that starts from the buttock and radiates down the side of the thigh and leg. It may reach the top of the foot or the big toe. Tingling, a burning sensation, or numbness may accompany the pain. Weakness in lifting the foot may also occur. Pain in the big toe does not confirm, on its own, L5 involvement. Other causes can produce symptoms in this region. To better understand this sign, read our page on big toe pain and possible causes. The path of L5 sciatica is also explained in this article on the painful path associated with the L5 root. Irritation of S1 can cause pain that radiates down the back of the thigh and calf, then towards the heel, the sole of the foot, or the little toe. Weakness in pushing on the foot or standing on tiptoe may sometimes be present. A change in the Achilles reflex may also be observed during a medical examination. The path is not the same for everyone. The location of the pain helps guide the assessment, but it does not solely determine which root is responsible. Also consult the information regarding irritation of the S1 root and why the L5-S1 level is often involved in sciatica. The healthcare professional focuses on the path of the pain, sensations, strength, and reflexes. Pain on the top of the foot or towards the big toe can indicate L5. Pain behind the calf or underneath the foot can point to S1. These references help guide the examination without replacing an individual diagnosis. A summary of the paths L4, L5, and S1 is presented in this article on pain according to the L4, L5, and S1 roots. This comparative resource on L5 and S1 sciatic pain also provides anatomical references. For a general overview of anatomy, causes, and symptoms, consult this article on sciatica and its management. The evaluation begins with questions about the onset of pain, its path, the positions that modify it, and associated symptoms. The professional then checks, according to their field of practice, movements, sensitivity, strength, and certain reflexes. An evaluation aims to determine whether the symptoms warrant a medical consultation or further examinations. The lumbar MRI allows visualization of the discs, foramina, and nerve structures. The results must correspond with the symptoms and the examination. Some individuals exhibit a narrow foramen on imaging without corresponding pain. Conversely, the decision to request an MRI depends on the clinical situation and the present signs. An information page on the evaluation of sciatica in Montreal also describes the elements commonly considered. Imaging should therefore not be interpreted in isolation. The physician may request an MRI when there are alarm signs, unusual progression, neurological deficits, or persistent pain despite the proposed management. Management depends on the cause, the intensity of symptoms, the neurological state, and history. Several cases of sciatica improve with a non-surgical approach and appropriate follow-up. The medical professional can discuss medications and necessary examinations. It is important not to prolong self-medication, especially with anti-inflammatories, without relevant advice for one’s situation. At the TAGMED Clinic, an evaluation can help examine the available support options in Montreal or Terrebonne. Depending on the situation, care may include a specific osteopathic approach or . These approaches do not replace a medical diagnosis and may not be suitable for everyone. The professional must consider the symptoms, contraindications, and imaging results. An injection may be discussed by a physician in certain cases. Surgical intervention is sometimes considered if significant pain persists despite appropriate management, if weakness progresses, or if nerve compression clearly matches the symptoms. The decision depends on a medical evaluation and a discussion of the benefits and risks. Consult an emergency service immediately in cases of loss of control of the bladder or bowels, numbness in the perineum or the so-called “saddle” region, or significant or progressive weakness in a leg or foot. A fever associated with low back pain, recent trauma, or rapid deterioration also requires urgent medical advice. A foot drop, new weakness, or worsening severe pain should not be automatically attributed to known stenosis. These signs require quick evaluation. For general information on symptoms and care, also consult the resources from SOS Sciatique. No. The narrowing must correspond to the painful side, the trajectory of the symptoms, and the examination results. An image alone is not sufficient to identify the cause of the pain. No. The L5-S1 foramen is generally the exit point for the L5 root. The S1 root may be affected by another area of compression, such as a disc herniation or lateral recess stenosis at this level. No. Surgery pertains to selected situations, such as debilitating pain that persists despite appropriate management or progressive neurological deficits. A medical professional can assess the indication and present possible options. About the Author Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath, is the founding president of TAGMED and the ACMA association. He devotes his practice to chronic pain of the spine, low back pain, and pain consistent with sciatica, especially when the pain radiates to the buttock, leg, calf, foot, or toes. Through SOS Sciatique, he publishes educational content about sciatica symptoms and their possible causes, such as disc herniation, disc pinching, foraminal stenosis, or irritation of a lumbar nerve root. At the TAGMED Clinic, care may include, depending on the case, motorized neurovertebral decompression, specific osteopathy, or precision percussion. For an evaluation related to the treatment of sciatica in Montreal / Mont-Royal or to the treatment of sciatica in Terrebonne, consult the services available at the TAGMED Clinic. Medical Disclaimer: The information and advice provided on this site do not replace the opinion, diagnosis, or treatment of a healthcare professional. Please note that Dr. Sylvain Desforges, osteopath, is neither a medical doctor nor a physician, and is not specialized in a medical specialty as defined by the Collège des médecins du Québec. Manual medicine, functional medicine, and sports medicine as described on this site exclude any treatment or medical diagnosis made by a physician or medical specialist. Always consult your physician for any medical questions. For more details, please read our Complete Legal Notice.Why can the L5-S1 foramen narrow?
What symptoms may suggest L5 or S1 involvement?
Pain related to the L5 root
Pain related to the S1 root
How to differentiate between L5 sciatica and S1 sciatica?
How is the evaluation conducted?
What management options can be discussed?
When should one seek emergency care?
Frequently Asked Questions about L5-S1 foraminal compression
Does visible foraminal stenosis on MRI always explain sciatica?
Does L5-S1 foraminal compression always affect the S1 root?
Is surgery always necessary?
Sciatica in Montreal: Guidelines on L5-S1 foraminal compression
- The foramen is the opening between two vertebrae through which a nerve root exits.
- At L5-S1, its narrowing can irritate the L5 root, particularly in the presence of disc wear or osteoarthritis.
- Pain may originate from the lower back or buttock and radiate down the leg, sometimes to the foot.
- Tingling, burning, or numbness may accompany the pain.
- Pain towards the top of the foot or the big toe may indicate L5; however, the trajectory alone does not confirm the diagnosis.
- The evaluation combines symptoms, neurological examination, and, if indicated, an MRI.
- Depending on the evaluation, non-surgical management may include appropriate activity and progressive exercises.
- Emergency: significant or progressive weakness, loss of urinary or bowel control, or numbness of the perineum.
In Montreal, pain that starts from the lower back or buttock and radiates down the leg may be related to a irritation of the L5 or S1 nerve root. At the L5-S1 level, the narrowing of the foramen—the opening through which the nerve exits the spine—can contribute to the symptoms. A clinical evaluation helps determine whether imaging truly corresponds to the pain and to choose appropriate measures, without assuming that surgery is necessary.
Sciatica in Montreal: why L5-S1 is often involved
IN BRIEF The sciatica L5-S1 often corresponds to irritation of the S1 root, sometimes related to a herniated disc. The pain may start in the buttock and descend behind the thigh to the calf or the foot. In Montreal, understanding…
Sciatica in Montreal: L5 and difficulty lifting the foot
IN BRIEF The difficulty in lifting the foot with sciatica can indicate weakness related to the involvement of the L5 root, sometimes caused by a herniated disc. This foot drop increases the risk of falling and requires prompt medical evaluation;…
Understanding L5-S1 foraminal compression
The foramen is a passage located between two vertebrae. It allows a nerve root to leave the spinal column. At the L5-S1 level, this passage can narrow, particularly due to degenerative changes, a decrease in disc height, osteoarthritis, or vertebral sliding. The nerve can then become irritated, but the presence of narrowing on MRI alone does not prove that it is the cause of the symptoms.
What symptoms may occur?
Irritation of the L5 root can cause pain or burning sensations that radiate from the buttock to the side of the leg and the top of the foot, sometimes as far as the big toe. An involvement of S1 may rather radiate behind the thigh and calf, toward the heel or the outer edge of the foot. Tingling, numbness, or weakness may also occur, but these pathways vary from person to person.
Note the activities and positions that modify the pain: walking, standing, sitting, bending or extending the back. These observations can help the healthcare professional compare your symptoms with the examination and, if necessary, the medical images.
Sciatica in Montreal: S1 and difficulty rising up on the toes
IN BRIEF S1 sciatica can cause pain from the buttock to the calf and foot, as well as difficulty getting on tiptoe. This weakness may suggest irritation of the S1 nerve root, but is not sufficient to establish a diagnosis.…
Sciatica in Montreal: L4-L5 and pain towards the top of the foot
IN BRIEF The sciatica related to L4-L5 can radiate from the lower back to the buttock and the leg; pain on the top of the foot may suggest involvement of the L5 root, but the pathways vary and symptoms overlap.…
Recommendations for management
Have symptoms evaluated
A consultation allows for the examination of strength, sensitivity, reflexes, and gait, and then consideration of possible causes. An MRI may be indicated based on the duration, intensity, and progression of symptoms, or if neurological signs are present. It is preferable to relate the imaging results to the clinical history rather than relying on an isolated report.
Stay appropriately active
In the absence of urgent signs, generally avoid prolonged immobility. Gradually resume tolerated activities, adjusting their duration and intensity if they significantly increase leg pain. A rehabilitation program may include gradual mobility, strengthening, and trunk control exercises. A manual or osteopathic approach may be considered as accompaniment after evaluation, without replacing medical follow-up or guaranteeing nerve release.
For medications, injections, or other treatments, seek advice from a licensed professional who knows your history and risks. Treatments are not suitable for everyone, and an injection does not necessarily correct anatomical narrowing.
Sciatica in Montreal: pain in the big toe, L5 root or another cause?
IN BRIEF Pain that radiates toward the big toe may indicate irritation of the L5 root, sometimes related to a herniated disc, but other causes are possible. In Montreal, evaluating the pain pathway, strength, sensitivity, and walking helps guide management…
Sciatica in Montreal: why the affected root changes the pain pathway
IN BRIEF Sciatica refers to pain or nerve symptoms that vary depending on the affected lumbar root. Pain, tingling, or numbness may manifest in the buttock, thigh, calf, or foot. Understanding this distribution helps guide the assessment, without diagnosing based…
When to seek emergency care
Go to the emergency room promptly in case of loss of bladder or bowel control, numbness in the perineal area, significant or progressive weakness, or a new foot drop. Fever, recent trauma, or rapid deterioration also justifies urgent evaluation.
Sciatica in Montreal: L4-L5 disc, L5-S1 disc, and leg pain
IN BRIEF Sciatica refers to pain that can radiate from the lower back or buttock down the leg, sometimes related to nerve irritation near the L4-L5 or L5-S1 discs. The level of the disc alone is not sufficient to identify…
Sciatica in Montreal: understanding the lumbar levels on an MRI
IN BRIEF A lumbar MRI shows the levels of the spine, such as L4-L5 and L5-S1, where a narrowing or herniation may sometimes be associated with sciatica. In Montreal, understanding these images along with the pain pathway, walking, and neurological…
About the author and disclaimer
Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath, is the founding president of TAGMED and the ACMA association. He publishes educational content on chronic spinal pain, lower back pain, and symptoms compatible with sciatica.
Medical disclaimer: this content is provided for educational purposes and does not replace a consultation, diagnosis, or treatment by a licensed healthcare professional. The author is neither a physician nor a specialist in a medical specialty recognized by the Collège des médecins du Québec.
| Marker | Key points |
|---|---|
| L5-S1 foraminal compression | The narrowed foramen can irritate the exiting L5 root. |
| Possible S1 involvement | At this level, S1 may be affected in the lateral recess, depending on the cause. |
| Common causes | Disc wear, osteoarthritis, osteophytes, or vertebral sliding. |
| L5-type pain | Buttock, side of the leg, top of the foot, and sometimes big toe. |
| S1-type pain | Buttock, back of the calf, heel, or outer edge of the foot. |
| Assessment in Montreal | The clinical examination guides the interpretation of images and choice of care. |
| Initial options | Appropriate activity and personalized management; avoid prolonged rest. |
| Emergency | Progressive weakness, loss of urinary or bowel control: consult without delay. |
Illustrative testimonies on sciatica in Montreal: understanding L5-S1 foraminal compression
Important: the testimonials below are fictional and composite examples, created for educational purposes. They do not correspond to real patients and do not guarantee any outcomes. Pain that radiates down the leg can have various causes; only an individual assessment can help determine whether L5-S1 foraminal compression is involved.
A pain that radiates down to the foot
“For several weeks, I had pain in my lower back and buttock, followed by a burning sensation radiating behind my thigh down to my calf and the edge of my foot. I thought that all sciatica necessarily came from a herniated disc. I realized that a narrowing of the passage where a nerve root exits could also be considered, but that the imaging should be related to my symptoms and clinical examination.”
A L5-S1 foraminal stenosis corresponds to a narrowing of the opening between the L5 and S1 vertebrae, through which a nerve root passes. Depending on the affected root, pain, tingling, or numbness can follow different pathways in the buttock and leg. However, these symptoms alone are not sufficient to confirm the diagnosis.
Symptoms sometimes worsened by walking
“My leg would become heavy after standing for a while or walking. Changing position or sitting sometimes alleviated the discomfort. I was told that these variations could be useful to describe during a consultation, but do not alone prove that it was a foraminal stenosis.”
Pain related to nerve irritation can be accompanied by burning, electrical shocks, tingling, or weakness. Some people notice worsening in specific postures, but reactions vary. The professional examination considers the course of the pain, strength, sensitivity, reflexes, and the ability to walk.
Understanding the role of MRI
“My MRI report mentioned a narrowing at L5-S1, and I initially thought this necessarily explained all my pain. I then understood that an image is not read in isolation: we must check if the observed level corresponds to my symptoms and the results of the examination.”
The lumbar MRI can help visualize the discs, foramina, and nerve structures. However, signs of wear or narrowing may be present without causing symptoms. The diagnosis relies on the correlation between the clinical history, examination, and, when indicated, imaging. The healthcare professional determines if further examinations are necessary.
A tailored approach rather than a generic one
“What helped me to better navigate was obtaining explanations about the possible options and their limits. I was able to discuss the gradual return to my activities and the situations where quick consultation was necessary.”
In the absence of urgent signs, management may include tailored and progressive activity, guided exercises, and individualized advice. Medications or injections are subject to a medical evaluation that considers the situation and contraindications. A manual approach may, in some cases, be considered as support; it does not replace medical diagnosis or prescribed care.
In Montreal, an evaluation allows for discussion of symptoms, their evolution, and appropriate options based on the history. It is important to avoid manipulations or exercises that significantly worsen symptoms and not to prolong self-medication without professional advice.
When to seek help quickly
“I learned that progressive weakness or loss of control of the bladder or bowel should not wait for a regular appointment.”
Consult urgently in case of loss of bowel or bladder control, numbness in the saddle area, significant or progressive weakness of the leg or foot, fever, recent trauma, or rapid worsening. These signs require urgent medical evaluation.
About the author
Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath, is the founding president of TAGMED and the ACMA association. His practice is dedicated to chronic spinal pain, lower back pain, and pain compatible with sciatica. The care offered may include, depending on the evaluation, motorized neurovertebral decompression, specific osteopathy, or precision percussion.
Medical disclaimer
This content is provided for educational purposes and does not replace a consultation, diagnosis, advice, or treatment from a physician or another authorized healthcare professional. The author is neither a physician nor a specialist in a medical specialty recognized by the Collège des médecins du Québec. Osteopathy, manual medicine, or functional support approaches do not constitute medical acts and are not intended to replace medical follow-up.
Sciatica refers to pain that generally follows the path of a nerve root from the lower back or buttock down the leg. In Montreal, individuals seeking an explanation for persistent pain may hear about L5-S1 foraminal compression. This term describes a narrowing of the foramen, the lateral passage between two vertebrae through which a nerve root exits. At the L5-S1 level, this reduction in space can irritate or compress a root, but an image of narrowing alone is not sufficient to explain the symptoms.
The cause may be associated with several changes in the lumbar spine: decrease in disc height, osteoarthritis of the joints, presence of bone spurs, or vertebral sliding. A herniated disc may also contribute to nerve irritation. The pain may start in the lower back or buttock and then descend behind the thigh and calf to the heel or the outer edge of the foot. Tingling, a burning sensation, or numbness may also occur. However, the path varies among individuals and does not confirm the cause on its own.
An evaluation typically begins with the history of symptoms and a clinical examination: their location, the movements that worsen or relieve them, muscle strength, sensitivity, reflexes, and the ability to walk are especially taken into account. A lumbar MRI may be requested when the clinical picture justifies it, for example, if symptoms persist, worsen, or are accompanied by neurological signs. Its interpretation must be correlated with the examination, as some individuals show visible narrowing without corresponding pain.
Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath, is the founding president of TAGMED and the ACMA association. His practice focuses in particular on chronic spinal pain, lower back pain, and symptoms compatible with sciatica. His approach emphasizes the assessment of the situation, understanding the factors that may influence pain, and guidance towards options suited to each individual’s case.
At the TAGMED Clinic, the care offered may include, depending on the evaluation and needs, motorized neurovertebral decompression, specific osteopathy, or precision percussion. These approaches are not necessarily suitable for everyone and do not replace a medical diagnosis or follow-up with an authorized healthcare professional. When L5-S1 foraminal compression is considered, it is important to discuss options with a professional who can take into account symptoms, history, examination findings, and imaging results.
Management may also include a gradual return to activities, tailored exercises, and advice to avoid prolonged immobility, if appropriate. Treatments should be individualized: an approach beneficial for one person may not suit another. Significant or progressive weakness of the leg or foot, loss of bowel or bladder control, numbness in the saddle area, fever, or rapid worsening require urgent medical evaluation.
Medical warning: this information is educational and does not replace a consultation, diagnosis, or treatment performed by a licensed healthcare professional. Sylvain Desforges is neither a physician nor a specialist in a medical specialty recognized by the Collège des médecins du Québec. The approaches of osteopathy, manual medicine, or functional support are not medical acts and do not replace medical follow-up.
In Montreal, pain that radiates from the buttock down to the calf, heel, or foot may sometimes be related to irritation of the L5 or S1 nerve root, particularly when compressed at its exit from the spine in the foramen. However, an MRI image of narrowing is not sufficient to establish the cause of the symptoms: the course of the pain, the neurological examination, and the imaging results must be considered together.
To remember about L5-S1 foraminal compression
The L5-S1 level corresponds to the space between the last lumbar vertebra and the sacrum. If the foramen narrows, the root passing through it can be irritated and cause pain, burning sensations, tingling, or numbness in the leg or foot. The trajectory varies depending on the affected root: pain towards the heel or the sole of the foot can particularly direct the evaluation towards S1. To better understand this pattern, check our page on L5-S1 sciatica with pain towards the heel or foot.
A herniated disc is not the only possible explanation. Disc wear, osteoarthritis, loss of disc height, or vertebral slippage can also contribute to foraminal narrowing. An MRI report must therefore be interpreted according to the symptoms and examination, rather than considered in isolation. To delve deeper into this distinction, you can read the information on the correlation between herniated disc and sciatica as well as on the mechanisms of severe L5-S1 foraminal stenosis.
The management depends on the severity of the symptoms, their duration, and the presence or absence of weakness. When there are no alarm signs, a conservative approach can be discussed with a healthcare professional: adapted activity, progression of exercises, and individualized advice. Injections may be considered in certain situations after medical evaluation; however, they do not necessarily eliminate the narrowing itself. For more information on this option, consult this resource dedicated to L5-S1 lumbar injection.
A professional evaluation can help verify whether the imaging actually corresponds to the painful path and the signs observed during the examination. In Montreal, individuals who wish to better understand the lumbar levels described in their report can consult our page on reading lumbar levels on an MRI. Care options should be determined according to each situation, without replacing a diagnosis or medical follow-up.
Finally, significant or progressive weakness, a foot drop, loss of sensation in the perineal area, or difficulties controlling the bladder or intestines require urgent evaluation. In the presence of these signs, consult an emergency service or a healthcare professional immediately.
Dr Sylvain Desforges, B.Sc., D.O., N.D., osteopath, is the founding president of TAGMED and of the ACMA association. He dedicates his practice to chronic spinal pain, low back pain and symptoms compatible with sciatica, particularly when pain radiates toward the buttock, leg, calf, foot or toes.
Through SOS Sciatique, he publishes educational content on sciatica symptoms, possible causes such as disc herniation, disc narrowing, foraminal stenosis or irritation of a lumbar nerve root, as well as non-surgical approaches that may be considered according to the evaluation. At Clinique TAGMED, care may include, depending on the case, motorized neurovertebral decompression, specific osteopathic care or precision percussion.
For an evaluation related to sciatica treatment in Montreal / Mount Royal or sciatica treatment in Terrebonne, please consult the services available at Clinique TAGMED.
Medical disclaimer
The information published on SOS Sciatique is provided for educational purposes only and does not replace a consultation, diagnosis, opinion or treatment provided by a physician or another authorized healthcare professional. The author of this article is neither a medical doctor nor a specialist in a medical specialty recognized by the Collège des médecins du Québec. The osteopathic, manual medicine or functional support approaches described on this site do not constitute medical acts and are not intended to replace medical follow-up.
Consult a physician or emergency service in cases of loss of bladder or bowel control, anesthesia in the saddle area, significant or progressive weakness in the leg or foot, fever, recent trauma, severe pain or rapid worsening of symptoms. For more details, please read our Legal Notice.
