A spinal block is a single injection of numbing medicine into the fluid around the spinal cord in the lower back. It is a type of regional anesthesia, which means it blocks feeling in part of the body while you stay awake. It is often used for surgery below the waist, such as lower abdominal, pelvic, or lower leg surgery.

The medicine starts working right away or within seconds, and it can numb the area from the lower abdomen and pelvis down to the toes. The effect usually lasts for the procedure and for a few hours after. Unlike an epidural, a spinal block is usually given as one shot, so it does not usually use a catheter, which is a small tube left in place.

During the procedure, your pulse, blood pressure, and oxygen level are checked. You may also get IV fluids and medicine to help you relax. Verify the exact plan with your surgical or anesthesia team in case they want something different for you.