There are several reasons for stomach pain in the middle of the night. First, it is due to gastrointestinal diseases, including enteritis, intestinal spasm, intestinal obstruction or constipation, these diseases are due to primary gastrointestinal diseases coupled with cold in the middle of the night, or eating too much or too much before going to sleep, are likely to induce the phenomenon of abdominal pain in the middle of the night. Second, abdominal pain in the middle of the night may also be urinary system diseases, including cystitis, urethritis, and even upper urinary tract infections these diseases. It may also be renal colic caused by ureteral stones, this pain also occurs easily in the middle of the night, and the suddenness is very strong, the pain is very intense.