Sometimes the stomach hurts and sometimes it doesn’t (paroxysmal abdominal pain), which may be caused by stomach cramps, enteritis, irritable bowel syndrome and other factors. 1. Gastroparesis: gastroparesis is mainly caused by the contraction of the smooth muscle of the stomach after eating irritating, cold food, which is clinically manifested as paroxysmal pain in the stomach, accompanied by nausea and vomiting, but the pain is mostly confined to the upper part of the abdomen. 2. Enteritis: enteritis is due to the consumption of unclean food, caused by bacterial reproduction of inflammation, and inflammation will stimulate intestinal peristalsis, accelerated flow will cause the phenomenon of stomach pain, this situation will improve after a period of relief. 3. Irritable bowel syndrome: irritable bowel syndrome in the rest is not good, eat irritating food, it will stimulate the intestinal tract, intestinal peristalsis will be accelerated, so there will be a tummy ache, but when this symptom is usually after a period of time will disappear. It is recommended to go to the hospital for examination, the doctor will give judgment according to the clinical symptoms, and clarify the cause of the disease and timely symptomatic treatment.