Sciatica refers to pain that radiates along the path of the sciatic nerve — the longest and widest single nerve in the human body. The sciatic nerve originates in the lower back, branches through the hips and buttocks, and runs down each leg. Sciatica most often affects one side of the body, causing pain that can range from a mild ache to a sharp, burning, or electric shock-like sensation.

The Sciatic Nerve

The sciatic nerve is formed from nerve roots that exit the lumbar (lower) and sacral spine at levels L3 through S3. It travels through the buttock, down the back of each thigh, and divides into smaller branches that serve the lower leg and foot. Because it controls sensation and muscle function throughout the lower limb, irritation or compression anywhere along its path can produce wide-ranging symptoms.

Common Causes

True sciatica is a symptom rather than a diagnosis — it results from irritation or compression of the sciatic nerve, most often due to:

• Herniated or bulging disc – the most common cause; disc material presses on a nerve root
• Spinal stenosis – narrowing of the spinal canal that puts pressure on the nerves
• Degenerative disc disease – age-related disc breakdown causing nerve irritation
• Piriformis syndrome – the piriformis muscle in the buttock irritates the sciatic nerve
• Spondylolisthesis – one vertebra slips over another, compressing nerve roots
• Tumors, bone spurs, or infections (less common)
• Trauma or injury to the lumbar spine or hip

Symptoms

Sciatica symptoms typically occur on one side of the body and may include:

• Pain in the lower back that radiates through the buttock and down the back of the leg
• Sharp, burning, or shooting pain — sometimes described as a jolt or electric shock
• Numbness, tingling, or weakness in the affected leg or foot
• Pain that worsens with sitting, coughing, or sneezing
• Difficulty moving or controlling the leg (in severe cases)

Symptoms can range from infrequent and irritating to constant and debilitating. Severe or progressive sciatica — especially with bladder or bowel changes — requires urgent medical attention.

Diagnosis

A physician will take a medical history and perform a physical exam, including neurological tests such as the straight-leg raise (SLR) test. Imaging studies may be ordered, such as X-rays (to rule out bone abnormalities), MRI (to visualize soft tissue and nerve compression), or CT scans. Nerve conduction studies may be used to assess nerve function.

Treatment Options

Most cases of sciatica improve with conservative, non-surgical care over several weeks to months. Treatment options include:

• Physical therapy – stretching and strengthening exercises to relieve nerve pressure and support spinal alignment
• Medications – anti-inflammatories (NSAIDs), muscle relaxants, nerve pain medications (gabapentin, pregabalin), or short-term oral steroids
• Hot and cold therapy – ice packs in the first 48–72 hours; heat afterward to relax muscles
• Epidural steroid injections – corticosteroid delivered near the affected nerve root to reduce inflammation
• Chiropractic care or massage therapy – may provide relief for some patients
• Surgery – reserved for cases that do not respond to conservative treatment or where there is significant nerve damage; common procedures include microdiscectomy and laminectomy

Prevention and Self-Care

Steps that may reduce the risk of developing or worsening sciatica include maintaining good posture, using proper body mechanics when lifting, strengthening core muscles, maintaining a healthy weight, and avoiding prolonged sitting. Regular low-impact exercise such as walking or swimming can help keep the spine healthy and reduce inflammation.

When to See a Doctor

Seek prompt medical attention if sciatica is accompanied by loss of bladder or bowel control, progressive leg weakness, or if symptoms are severe, sudden in onset, or follow a traumatic injury. These may indicate cauda equina syndrome, a rare but serious condition requiring emergency care.