A common component of tummy tuck surgery is repair of a rectus diastasis. This is a separation of the vertical rectus abdominus muscle into right and left halfs. Often thought of as a hernia, it is not a defect or hole in the abdominal wall. Normally the rectus muscles are joined by the linea alba in the midline. During pregnancy this connection is stretched and is separated into two halfs but is connected by a thin layer of fascia. During a tummy tuck, the two halfs of the muscle are sewn together back together by fascial sutures. This is done only if it aids in making the abdominal profile flatter. Because rectus diastasis is a cosmetic condition, it is not covered by medical insurance.