The common causes of abdominal pain in flat support are physiological phenomenon, trauma, digestive system diseases and so on. 1. Physiological phenomenon: if usually lack of exercise, muscle strength is insufficient, directly carry out a large number of flat support exercise, lactic acid accumulation in the abdominal muscles, can cause pain, is a normal phenomenon. 2. Trauma: there is a clear history of trauma, trauma leads to abdominal skin, subcutaneous tissue damage, abdominal muscle tension contraction of flat support, pain can also occur. 3. Digestive system diseases: for example, chronic gastritis, gastric ulcer, duodenal ulcer, etc., when doing flatbed support, the pressure of the abdomen increases, and the gastrointestinal tract is stimulated, which can cause pain. Doing flatbed support when the abdomen is more causes, may also be related to kidney stones, gallstones, coronary heart disease and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, targeted treatment.