The causes of stomach discomfort at 4:00 or 5:00 p.m. are mainly due to: 1. hunger, the stomach has been emptied at 4:00 or 5:00 p.m. Most of the food eaten at noon has been decomposed, absorbed and utilized in the intestine, especially after a lot of exercise, there is a feeling of empty stomach, accompanied by hyperactive intestinal sounds. 2. abdominal pain, mainly seen in people suffering from duodenal ulcer, when the stomach is in a cavity state, stomach acid is relatively excessive. The pain in the upper and middle abdomen can be relieved after eating. 3, indigestion, mainly due to the gastrointestinal tract power disorder, resulting in the food eaten at noon can not be digested and retained in the intestine, the food residue digestion when there is gas production, and abdominal distension, belching and other phenomena.