Bilateral foraminal stenosis is a condition in which the openings where the nerve exits the spine (the intervertebral foramen) have become narrowed on both the right and left side. The nerve root passes out of the spinal canal through the foramen. When the space becomes smaller, the nerve root can be irritated or compressed, which may cause radiating pain, numbness, and sometimes weakness.
Bilateral foraminal stenosis becomes more common with increasing age and often develops as part of degenerative changes in the spine, for example disc degeneration, bony overgrowth, or osteoarthritis in the facet joints. Symptoms may develop gradually, but can also be triggered or worsened after strain or certain movements.
Common symptoms of bilateral foraminal stenosis
Here are common symptoms that may occur with bilateral foraminal stenosis – and what is typical for the condition:
- Radiating pain (radicular pain) that often radiates down one leg, but with bilateral involvement you may have symptoms in both legs.
- Pain in the lower back or neck that may be dull/aching or sharper and “stabbing,” depending on the level and load.
- Numbness or tingling in the legs and foot when the lumbar spine is affected, or in the arm and hand when the cervical spine is affected, often in a clearly defined area (e.g., the outer lower leg/foot or the thumb/index finger), depending on which nerve root is involved.
- A burning or electric sensation that is especially felt with certain movements, coughing and sneezing, or prolonged loading.
- Muscle weakness, which may be noticed as the foot “not holding up,” tripping more easily, or reduced grip strength (with cervical involvement).
- Pain that worsens with backward bending (extension); many experience more symptoms when arching the back, standing for a long time, or walking uphill.
- Some people find the pain is relieved when bending forward. Leaning forward or sitting down can sometimes reduce irritation around the nerve root and dampen symptoms, but the effect varies.
Symptoms depend on which level of the spine is affected. Foraminal stenosis in the lumbar spine most often causes symptoms in the legs and feet, while foraminal stenosis in the cervical spine more often causes symptoms in the arms and hands.
3 typical features of bilateral foraminal stenosis
- The symptoms are not only felt locally in the back – they often radiate along the course of the nerve.
- Certain positions, such as lumbar lordosis and extension, can trigger symptoms, while others, such as flexion and sitting, can relieve them.
- You have symptoms on both sides, but it is common for one side to feel more pronounced than the other.
When should you seek medical care?
You should contact healthcare services if you experience any of the following that either affect your everyday life or do not improve with self-care:
- Numbness, tingling, or weakness
- Increasing radiating pain in the leg/arm
- Night pain or pain that worsens rapidly
If you experience any of the following, you should seek urgent medical care:
- Difficulty urinating, urinary retention, or loss of control over urine/stool.
- Numbness in the groin/saddle area.
- Rapidly worsening weakness in the legs.
This may indicate serious nerve involvement that needs prompt assessment by a doctor.
What happens in the body with foraminal stenosis
With foraminal stenosis, the space in the nerve’s exit opening becomes smaller. This can be due to several mechanisms that often act together:
- Disc degeneration, meaning the disc loses height, causing the foramen to “collapse.”
- Disc bulging or a herniated disc, where soft tissue can press on the nerve root.
- Bony overgrowth (osteophytes), meaning the body forms bone that can reduce the available space.
- Facet joint osteoarthritis, meaning enlarged or altered joints that affect the foramen.
- Vertebral slippage (spondylolisthesis), which can change the anatomy and create crowding.
When the nerve root becomes irritated, pain signals, sensory changes, and sometimes muscle weakness can occur – often in a pattern that matches the nerve that is affected.
The difference between bilateral foraminal stenosis and spinal stenosis
It’s easy to mix up these terms. Spinal stenosis means a narrowing in the spinal canal (centrally), where several nerve roots – or in the cervical spine, even the spinal cord – can be affected at the same time. Foraminal stenosis instead means a narrowing in the nerve’s exit opening (the intervertebral foramen, more laterally), which more often causes radicular symptoms, such as radiating pain, numbness, or tingling.
It is possible to have both at the same time – for example central spinal stenosis and bilateral foraminal stenosis at the same level.
Treatment of bilateral foraminal stenosis
Treatment for bilateral foraminal stenosis is tailored to how severe the symptoms are and whether there are signs of nerve involvement.
Some common treatment options include:
- Physiotherapy – you get exercises that strengthen the core/back, improve posture and mobility, and advice on how to reduce strain on the back in everyday life.
- Pain relief – some may be helped by common analgesics, such as paracetamol/acetaminophen or anti-inflammatory medicines (NSAIDs).
- Activity modification – avoid movements and positions that trigger the pain, take more breaks, and find ways of moving that feel better.
- Injections – if symptoms are significant, an injection with corticosteroid/local anesthetic near the nerve can sometimes reduce irritation and pain.
If symptoms are severe or persist despite treatment
With persistent severe pain, clear nerve involvement, or weakness, surgery may become an option. Decompression (e.g., foraminotomy) means widening the space where the nerve passes. In some cases, decompression is combined with a stabilizing procedure if the spine is unstable.
What you can do yourself – exercises that may reduce symptoms
The right type of exercise can help by improving stability, mobility, and reducing irritation around the nerve. The focus is usually on:
- Strengthening the core muscles (back and abdomen)
- Improving hip and spinal mobility
- Finding relieving positions and better movement patterns
- Nerve-mobilizing exercises (sometimes, if a physiotherapist assesses that it’s appropriate)
Here you can read more about good exercises to try for bilateral foraminal stenosis.
This is what you should avoid with foraminal stenosis
- Heavy lifting with an arched lower back and repetitive backward bending that clearly triggers symptoms.
- Running/jumping if it increases pain or radiating symptoms.
- Prolonged static standing without breaks, if it provokes symptoms.
- Exercises that cause a clear increase in nerve pain (electric/burning radiating pain).
How can you find out if you have bilateral foraminal stenosis?
The diagnosis is based on symptoms that match clinical findings and imaging.
- Clinical examination by a doctor: assessment of pain pattern, neurological status (sensation, strength, reflexes), movement tests, and gait.
- MRI (magnetic resonance imaging): this is usually the best method to see narrowing in the foramen and any nerve root contact and compression.
- CT: can be an alternative if MRI is not possible and can provide a good view of bony overgrowth.
- X-ray: can show skeletal changes and vertebral slippage, but does not show nerves as well.
To get a correct diagnosis, symptoms, examination findings, and imaging results should align.