Sciatica is caused by a herniated disc in the lower back that causes pain and numbness in the buttock that extends down the leg. Sciatica is the most common symptom of a herniated disc in the lower back that puts pressure on the sciatic nerve. The pain most often occurs on one side. It may get worse after sitting / standing / walking / bending backwards, at night, or when you sneeze, cough or laugh.
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