Ileus is a condition where there is a non-mechanical decrease or stoppage of the flow of intestinal contents, leading to the intolerance of oral intake due to inhibition of the gastrointestinal propulsion without signs of mechanical obstruction. Unlike intestinal obstruction, ileus is not caused by a physical blockage, and it rarely leads to rupture. The most common cause of ileus is abdominal surgery, which can cause a stress response that immobilizes the digestive tract. Other causes include medications, illness or injury, poor general health, severe weight loss, and lots of time spent lying on your back. Symptoms of ileus include abdominal bloating and pain caused by a buildup of gas and liquids, nausea, vomiting, severe constipation, loss of appetite, and cramps. Diagnosis of ileus is dependent on radiographic evidence, usually on a CT scan or small bowel series, and a doctors examination. Treatment for ileus depends on how bad the symptoms are and the cause, but it usually involves no food or fluids by mouth for 24 to 72 hours, and sometimes hospital admission may be required. Without treatment, ileus can perforate or tear the intestine, which can be deadly.