Sudden pain in the stomach is often caused by the following reasons: 1. urinary stones, when a stone is produced in the kidney and dislodged downward to the narrowing of the ureter, it will cause severe pain in the abdomen, and can also be accompanied by pain in the back, and need to go to the hospital to check the urological ultrasound and urinary routine, etc. for clarification. If the disease is caused by the disease, it is necessary to actively carry out diuresis and, if necessary, lithotripsy or surgery; 2. It may be caused by other intestinal diseases, such as intussusception, mesenteric artery thrombosis or abdominal aortic aneurysm.