Hidden pain in the abdomen at night, not during the day, mostly due to the evening environment is quiet, people are in a state of rest, attention is easily focused on the part of the abdominal discomfort, and at this time the visceral sensitivity is high, for the abdominal pain is more sensitive due to hidden pain. Common diseases are as follows. 1. Upper gastrointestinal ulcer: after the onset of the disease, the patient may appear before and after eating abdominal pain as well as hidden pain at night, mostly accompanied by nausea, acid reflux, belching and other symptoms. 2. Gastritis: the secretion of gastric acid increases at night, and for a longer period of time without food, gastric acid loses the neutralizing effect of food, it is easier to cause the original mucous membrane of the stomach erosion and other injuries at the onset of the symptoms of epigastric pain. 3. Pancreatitis: Patients with chronic pancreatitis may experience nocturnal abdominal pain, which is mostly in the mid-abdomen and the left side of the upper abdomen, and the pain may radiate to the lower back. 3. Gallbladder lesions: common lesions include cholecystitis, gallbladder stones, gallbladder cancer, etc. The above lesions may induce nocturnal occult pain in the right upper abdomen. 4. Tumors: Tumors in stomach, gallbladder, liver, pancreas, intestines and other parts of the body may also cause abdominal pain at night, but not during the day. It is necessary to confirm the diagnosis of the lesion through relevant examinations. There are many other diseases that cause abdominal pain at night and normal pain during the day, such as colitis and intestinal parasitic diseases. Therefore, you should go to the hospital in time, complete the examination, clear diagnosis and then be treated accordingly.