Diastasis recti is defined as a gap of 2.7 cm or more between the rectus abdominis muscles, often occurring in pregnant or postpartum women due to the stretching caused by the growing uterus. Symptoms include a visible belly bulge, pelvic or back pain, and difficulty with normal activities, with risk factors including multiple pregnancies and being over 35. Treatment includes physiotherapy, proper posture, and avoiding exercises that increase abdominal pressure.