Abdominal pain may be caused by the accumulation of lactic acid due to excessive exercise, or it may be caused by intestinal inflammation or intestinal spasm caused by feeling wind and cold due to unclean diet. 1. Excessive exercise: after excessive exercise in the abdomen, the muscles produce a large amount of lactic acid due to anaerobic or anoxic environment, which accumulates inside, thus leading to the symptoms of abdominal pain, usually a few days after the symptoms can disappear on their own. 2. Dietary impurity: Dietary impurity can lead to the occurrence of enteritis, intestinal inflammation will stimulate intestinal peristalsis, leading to the occurrence of abdominal pain symptoms. 3. Feeling the wind and cold: due to improper warming measures to make the abdomen cold, stimulation of the vagus nerve can cause intestinal spasm symptoms, intestinal spasm occurs will cause abdominal pain. If the abdominal pain cannot be relieved on its own or is accompanied by other symptoms, you should go to the hospital in time, under the guidance of a professional doctor to clarify the cause of the disease, so as not to delay the condition.