Stomach pain can be caused by stomach cramps, acute gastritis, peptic ulcer and so on. 1. Stomach cramp: mainly persistent pain, paroxysmal aggravation, pain can not straighten up. There can also be nausea, vomiting and other manifestations of acute gastritis. When there is physical stimulation, such as the stomach is cold or eat cold food, or drug stimulation, alcohol, coffee, strong tea stimulation, etc., then the stomach wall muscle is easy to spasm. 2. Acute gastritis: some patients may suffer from pain so much that they can’t stand up straight. Nausea, vomiting, and in severe cases, black stools. 3. Peptic ulcer:Gastric ulcer often manifests as fullness pain, sometimes the pain is very intense. Obviously after meals, can vomit blood, black stool, etc.. There may be other reasons for stomach pain, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment.