It seems that you are describing a hernia. A weakness or split in the muscle wall of the abdomen is called a "hernia". Hernias allows the abdominal contents (usually some part of the intestine) to bulge out. This bulge usually occurs during coughing, straining, or simply standing. If the symptoms are severe enough, the hernia is surgically repaired. There are different surgical approaches used by doctors to help solve this problem. To get a diagnosis, however, you may consult your primary health care doctor first.