Rectus diastasis is a partial or complete separation of the midline fascia of the abdominal wall between the rectus muscles. This occurs as a result of abdominal expansion usually seen after pregnancy or with massive weight gain.

The symptoms are less core strength, an increased abdominal bulge or pooch, and separation in the midline of the abdomen.

Rectus diastasis can be corrected with plication (sewing) the abdominal wall back together which is usually performed during a tummy tuck.