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.
Most Common Causes of Sciatica