Sciatica refers to pain, weakness, numbness, or tingling in the leg. It is caused by injury to or pressure on the sciatic nerve. Sciatica is a symptom of another medical problem. It is not a medical condition on its own.
Sciatica occurs when there is pressure or damage to the sciatic nerve. This nerve starts in the lower back and runs down the back of each leg. This nerve controls the muscles of the back of the knee and lower leg. It also provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot.
Sciatica pain can vary widely. It may feel like a mild tingling, dull ache, or burning sensation. In some cases, the pain is severe enough to make a person unable to move.
The pain most often occurs on one side. Some people have sharp pain in one part of the leg or hip and numbness in other parts. The pain or numbness may also be felt on the back of the calf or on the sole of the foot. The affected leg may feel weak. Sometimes, your foot gets caught on the ground when walking.
The pain often starts slowly. It may get worse:
After standing or sitting
When sneezing, coughing, or laughing
When bending backward or walking more than a few yards, especially if caused by spinal stenosis
Exams and Tests
The health care provider will perform a physical exam. This may show:
Weakness when bending the knee
Difficulty bending the foot inward or down
Difficulty bending forward or backward
Abnormal or weak reflexes
Loss of sensation or numbness
Pain when lifting the leg straight up off the examining table
Tests are often not needed unless pain is severe or long-lasting. If tests are ordered, they may include:
MRIs or other imaging tests
Because sciatica is a symptom of another medical condition, the underlying cause should be identified and treated.
In some cases, no treatment is required and recovery occurs on its own.
Conservative (non-surgical) treatment is best in many cases. Your doctor may recommend the following steps to calm your symptoms and reduce inflammation:
Apply heat or ice to the painful area. Try ice for the first 48 to 72 hours, then use heat.
Take over-the-counter pain relievers such as ibuprofen (Advil, Motrin IB) or acetaminophen (Tylenol).
Reduce your activity for the first couple of days. Then, slowly start your usual activities.
Do not do heavy lifting or twisting of your back for the first 6 weeks after the pain begins.
Start exercising again after 2 to 3 weeks. Include exercises to strengthen your abdomen and improve flexibility of your spine.
Physical therapy may also be recommended. Additional treatments depend on the condition that is causing the sciatica.
If these measures do not help, your doctor may recommend injections of certain medicines to reduce swelling around the nerve. Other medicines may be prescribed to help reduce the stabbing pains due to nerve irritation.
Nerve pain is very difficult to treat. If you have ongoing problems with pain, you may want to see a neurologist or a pain specialist to ensure that you have access to the widest range of treatment options.
Often, sciatica gets better on its own. But it is common for it to return.
More serious complications depend on the cause of sciatica, such as slipped disc or spinal stenosis. Sciatica can lead to permanent numbness or weakness of your leg.
When to Contact a Medical Professional
Call your doctor right away if you have:
Unexplained fever with back pain
Back pain after a severe blow or fall
Redness or swelling on the back or spine
Pain traveling down your legs below the knee
Weakness or numbness in your buttocks, thigh, leg, or pelvis
Burning with urination or blood in your urine
Pain that is worse when you lie down, or awakens you at night
Severe pain and you cannot get comfortable
Loss of control of urine or stool (incontinence)
Also call if:
You have been losing weight unintentionally (not on purpose)
You use steroids or intravenous drugs
You have had back pain before, but this episode is different and feels worse
This episode of back pain has lasted longer than 4 weeks
Prevention varies, depending on the cause of the nerve damage. Avoid prolonged sitting or lying with pressure on the buttocks.
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C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.