Overview
Sciatica is nerve pain that typically starts in the low back or buttock and travels down the leg along the sciatic nerve pathway. It is usually caused by irritation or compression of nerve roots in the lower spine, most commonly from a disc herniation or spinal stenosis. Because the nerve is affected, you may feel pain, tingling, numbness, or weakness rather than pain that stays only in the muscle. Symptoms often worsen with certain movements or positions that further irritate the nerve.
Symptoms
Sciatica commonly causes burning, shooting, or electric shock-like pain that radiates from the buttock down the back or side of the leg, sometimes reaching the foot. Many people also notice tingling or numbness in part of the leg, and some develop weakness that makes walking, climbing stairs, or lifting the foot harder. Symptoms are often worse with sitting, bending, coughing, or sneezing, and they may improve with short periods of walking or changing positions. Severe cases can include reduced sensation and noticeable changes in gait.
Causes
Sciatica most often develops when a structure in the lower spine irritates a lumbar nerve root. A herniated disc can press on the nerve, and degenerative changes such as bone overgrowth or thickened ligaments can narrow the space where the nerve travels. Less commonly, inflammation, pregnancy-related changes, or injury can contribute to nerve irritation. The result is abnormal nerve signaling that feels like pain, tingling, or weakness down the leg.
Risk Factors
Risk increases with age-related degeneration of the spine and with activities or jobs that involve heavy lifting, twisting, or prolonged sitting. Being overweight can add mechanical stress to the lower back, and smoking is associated with faster disc degeneration. You may also be at higher risk if you have a prior episode of low back pain, a history of disc disease, or reduced core and hip strength. Certain occupations, poor ergonomics, and sudden increases in activity can trigger or worsen symptoms.
Prevention
You can reduce recurrence risk by maintaining good back and hip conditioning through regular low-impact exercise, core strengthening, and mobility work as tolerated. Using safe lifting mechanics, avoiding repeated heavy twisting, and taking movement breaks during long sitting periods can help protect the lower spine. Maintaining a healthy weight and quitting smoking can also reduce long-term disc stress. When pain flares, early modification of activities and guided rehabilitation usually helps prevent prolonged worsening.
How the Diagnosis Is Evaluated
Clinicians typically start with a focused history about the pattern of pain, numbness, and any weakness, including what positions or activities trigger symptoms. A physical examination assesses strength, reflexes, and sensation, and may include straight-leg-raise or related nerve tension tests to identify nerve root involvement. Imaging is not always necessary for new or improving cases, but it may be ordered if symptoms are severe, persistent beyond several weeks, or accompanied by concerning neurologic changes. If needed, MRI is the preferred test to evaluate discs and nerve compression, while other tests may be considered in select situations.
Nonsurgical Treatment Options
Initial care usually focuses on reducing nerve irritation and improving function while the body settles the flare. This commonly includes activity modification, short-term pain control with anti-inflammatory medicines when appropriate, and a structured physical therapy program emphasizing nerve-friendly movement, core stabilization, and hip flexibility. Neuropathic pain medications may be used short term for some patients, and a clinician may also recommend muscle relaxants if spasm is present. If pain is persistent or limits participation in rehab, an epidural corticosteroid injection or selective nerve root block may help calm inflammation around the nerve. Many people improve with a combination of time, targeted exercise, and symptom-guided care.
When to Seek Medical Attention
Seek prompt medical attention if you develop new or worsening weakness in the leg or foot, trouble walking, or a foot drop. Get urgent evaluation if you have bowel or bladder changes, numbness in the groin or inner thighs, or symptoms that rapidly progress. You should also be seen urgently for fever, unexplained weight loss, a history of cancer, or significant trauma with severe back or leg pain. If symptoms are severe, last more than a few weeks, or keep returning, arrange routine evaluation for a targeted plan.
Frequently Asked Questions
Yes, many cases improve within weeks with conservative care, especially when symptoms are not rapidly progressing.
Not necessarily, because gentle, guided movement and physical therapy often help recovery, while complete rest for long periods can make stiffness worse.
Next Steps
If your symptoms are mild and stable, consider starting conservative care with activity modification and a home program or physical therapy guidance while monitoring neurologic changes. If pain is severe, not improving, or you notice weakness, numbness that spreads, or other red flags, arrange evaluation promptly so the cause and safest plan can be determined.