Sudden stomach cramps may be caused by stomach cramps, acute gastroenteritis, peptic ulcer and other conditions. 1. Stomach cramps: Eating too cold food or getting cold in the abdomen may cause the stomach muscles to twitch, resulting in a strong contraction of the stomach, and ultimately stomach cramps. 2. Acute gastroenteritis: eating unclean food can cause acute gastroenteritis, gastrointestinal peristalsis can be abnormally fast, resulting in gastric colic, may also be accompanied by diarrhea, nausea, vomiting and other symptoms. 3. Peptic ulcer: peptic ulcer patients can have symptoms of abdominal pain, will show the epigastric cycle, rhythmic pain, need to follow the doctor’s instructions to take acid, gastric mucosa protection drugs, etc., daily to maintain a good diet. When the ulcer is complicated by perforation, severe gastric colic may appear, and there will also be diffuse pain in the whole abdomen, plate-like abdomen and other signs. It is recommended to go to the hospital when sudden gastric colic occurs, and ask the doctor to make a judgment to clarify the cause of the disease.