A transversus abdominis plane block, also called TAP, is a type of injection that numbs the nerves on the front of the abdominal wall. A TAP is done to decrease pain caused by nerve irritation and swelling in that area.

The numbing medicine used is either a local anesthetic or a combination of a local anesthetic and a steroid. 

The medicine is placed between the layers of muscles in your abdomen, which are the muscles that you use to do a sit-up.