What Is Sciatica?

Sciatica describes pain and other nerve-related symptoms that follow part of the sciatic nerve distribution. It most commonly occurs when a lumbar or sacral nerve root becomes irritated or compressed.

The sciatic nerve forms from nerve roots between L4 and S3. It then travels through the buttock and down the back of the leg. Although symptoms may be felt along the nerve’s pathway, the underlying irritation frequently starts near the spine.

Sciatica is a symptom pattern rather than a diagnosis by itself. When a lumbar nerve root is affected strongly enough to cause neurological changes such as numbness, weakness or altered reflexes, clinicians may use the term lumbar radiculopathy.

Identifying the likely source of the symptoms helps guide treatment, further investigation and recovery planning.

What Are the Common Symptoms of Sciatica?

Sciatica usually affects one side. Symptoms often extend below the knee, although their location and severity can vary depending on the nerve root involved.

• Sharp, aching, burning or shooting pain into the leg
• Pins and needles or tingling
• Numbness in part of the leg or foot
• Weakness in the leg, ankle or foot
• Pain aggravated by sitting, bending, lifting, coughing or sneezing
• Reduced tolerance for walking, sitting, work or exercise

Some people have significant leg pain with little or no back pain. Others notice a combination of back, buttock and leg symptoms.

What Causes Sciatica?

Sciatica most commonly develops when a spinal nerve root becomes inflamed, irritated or compressed. A bulging or herniated disc is a frequent cause, particularly in younger and middle-aged adults.

Other possible causes include:

• Spinal stenosis, which reduces the available space around the nerves
• Spondylolisthesis, where one vertebra shifts relative to another
• Lumbar spondylosis and other age-related spinal changes
• Inflammation or sensitivity around a spinal nerve root

Not every episode involves severe structural compression. Symptoms can also remain sensitive after an initial flare, particularly when sitting, bending, lifting or activity levels change suddenly.

What Else Can Feel Like Sciatica?

Not every episode of buttock or leg pain comes from a spinal nerve root. Assessment may need to distinguish sciatica from other conditions that can produce similar symptoms.

Why Does Sciatica Cause Leg Pain?

Nerves carry signals between the spine and the leg. When a nerve root becomes irritated, symptoms can be felt anywhere within the area supplied by that nerve.

This may produce pain, tingling, numbness or weakness in the buttock, thigh, calf or foot, even though the main source of irritation is in the lower back. This pattern is one reason sciatica is considered a form of nerve pain rather than simple muscular soreness.

How Is Sciatica Diagnosed?

Sciatica is usually identified through a clinical assessment. One symptom, movement test or scan finding does not prove that a particular structure is responsible for the symptoms.

A physiotherapist may assess:

• Your back, hip and leg movement
• Positions that aggravate or ease symptoms
• Leg and foot strength
• Sensation and reflexes
• Nerve sensitivity and mobility
• Walking, sitting, lifting and other functional tasks

The assessment also considers whether another hip, back or neurological condition could be contributing to the symptoms.

Do You Need an MRI for Sciatica?

Most people with uncomplicated sciatica do not need an immediate MRI. Imaging may be considered when symptoms are severe, neurological changes are progressing, surgery or an injection is being considered, or symptoms are not improving as expected.

Healthdirect provides further general information about sciatica symptoms and medical care.

How Can Physiotherapy Help Sciatica?

Physiotherapy aims to help settle symptoms, restore movement tolerance, rebuild strength and support a gradual return to normal activity. The rehabilitation plan should match your symptoms, daily demands and likely source of irritation.

Education and Activity Guidance

Understanding which movements are temporarily sensitive can reduce unnecessary fear and help you remain active. Complete rest is rarely required. Instead, management commonly focuses on adjusting aggravating activities while gradually rebuilding tolerance.

Walking and General Movement

Walking often provides a practical way to maintain activity. During a flare-up, shorter and more frequent walks may be better tolerated than one long walk that significantly increases leg symptoms.

Exercise and Strengthening

Exercise may include progressive leg strengthening, trunk conditioning, walking and functional tasks. Depending on the presentation, this may involve core stability training and graded exercises for the hips and lower limbs.

Nerve Mobility Exercises

When appropriate, carefully prescribed nerve mobility exercises may help improve tolerance to movement. These exercises should remain gentle and should not repeatedly provoke strong or lasting leg symptoms.

Manual and Adjunct Therapies

Some people gain short-term symptom relief from manual therapy, massage, acupuncture or dry needling. These approaches may support comfort and movement but should not replace an active rehabilitation plan when exercise and graded activity are appropriate.

Returning to Work, Exercise and Daily Activity

Rehabilitation should gradually restore the activities that matter to you. This may include sitting, driving, lifting, household tasks, work duties, gym exercise or sport. Progress is usually based on symptom response rather than a fixed timetable.

How Long Does Sciatica Take to Recover?

Recovery time varies. Some people improve over several weeks, while others take several months. Symptoms may take longer to settle when nerve irritation has been present for an extended period or when weakness has developed.

Recovery can be influenced by:

• The underlying cause
• The severity and duration of the symptoms
• Whether strength or sensation has changed
• Work, lifting and activity demands
• Sleep, general health and recovery capacity
• How activity and exercise are progressed

Fluctuations do not always mean the condition is worsening. However, new or progressing weakness, increasing numbness or major bladder or bowel changes require prompt medical review.

When Should You Seek Help for Sciatica?

Consider an assessment when leg pain, numbness or weakness limits your sleep, sitting, walking, work or exercise. Assessment may also help when symptoms are not improving after the first couple of weeks or when you are unsure whether the problem is nerve-related.

Earlier review is appropriate when weakness is present, symptoms are progressing or pain is significantly affecting normal daily activities.

Related Sciatica and Back Pain Guides

FAQs About Sciatica

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References

1. Jensen RK, Kongsted A, Kjaer P, Koes B. Diagnosis and treatment of sciatica. BMJ. 2019;367:l6273. doi:10.1136/bmj.l6273.
2. Dove L, O’Keeffe M, O’Sullivan P, et al. How effective are physiotherapy interventions in treating people with sciatica? A systematic review and meta-analysis. J Physiother. 2023;69(1):3-15. doi:10.1016/j.jphys.2022.11.001.
3. Zaina F, Beyer F, Pillastrini P, et al. Identification of best evidence for rehabilitation to develop the WHO package of interventions for rehabilitation for low back pain. Arch Physiother. 2023;13(1):11. doi:10.1186/s40945-023-00166-w.
4. Zhang J, Yang M, Quan S, et al. Efficacy of epidural steroid injection in the treatment of sciatica secondary to lumbar disc herniation: a systematic review and meta-analysis. Front Neurol. 2024;15:1406504. doi:10.3389/fneur.2024.1406504.
5. Lequin MB, Verbaan D, Jacobs WCH, et al. Surgery versus prolonged conservative treatment for sciatica: 5-year results of a randomised controlled trial. BMJ Open. 2013;3(5):e002534. doi:10.1136/bmjopen-2012-002534.