Rectus diastasis for women During pregnancy, the rectus diastasis is caused by the increasing pressure of the uterus in the abdominal area. The muscles are more and more stretched and then spread apart, to lose their position as well as their normal function, in the centre of the body. After giving birth, the woman then sees a rectus diastasis appear in the form of a line in the middle of the abdomen. This line becomes more prominent when the skin is stretched. The stomach takes a round, swollen shape with a marked bulge in the centre. Concept Clinic offers remodelling techniques for the cure of rectus diastasis that will allow the new mother to recover her pre-pregnancy abdomen and a refined silhouette.