Fever accompanied by stomach pain may be related to acute cholecystitis, appendicitis, pancreatitis and so on. 1. Acute cholecystitis: stones block the bile ducts, resulting in poor bile excretion, accumulation of the body, stimulation of the gallbladder caused by gallbladder spasm, bleeding abdominal pain and discomfort. Fever is mainly caused by inflammation stimulating the body temperature center. 2. appendicitis: appendicitis attack, inflammation stimulation of gastrointestinal nerves or peritoneum, causing abdominal pain and discomfort, accompanied by fever. 3. Acute pancreatitis: During the attack of pancreatitis, the secretion of pancreatic fluid increases, leading to poor drainage of pancreatic fluid, or even blockage of the pancreatic duct, which in turn causes severe abdominal pain. The inflammation will produce a large number of thermogenic factors, which will enter the bloodstream and cause fever symptoms. There are many diseases that cause fever with stomach pain, such as acute gastroenteritis, peritonitis and so on. It is recommended to go to the hospital in time to find out the cause of the disease and then treat it as soon as possible.