Fever and abdominal pain is an infection of the abdominal organs, which can be a variety of diseases, mainly the following common diseases: 1, infectious diarrhea. It is also known as acute gastroenteritis, which can be accompanied by nausea and vomiting, and if mucus-purulent-blood stool appears, it suggests bacterial dysentery. 2, acute appendicitis. The main characteristic is metastatic right lower abdominal pain, that is, the abdominal pain is not in the right lower abdomen at the beginning, can be fixed to the right lower abdomen after the whole abdomen, the pressure pain at the McDonald’s point is positive, can be accompanied by nausea, vomiting. 3, acute cholecystitis. Usually pain in the right upper abdomen, fever, may be accompanied by chills, associated with eating fatty foods, can appear yellow urine. 4, acute pancreatitis. It shows pain in the left upper abdomen, and is related to heavy drinking or overeating. 5, urinary stones. Can also appear fever, abdominal pain, accompanied by hematuria and lumbago. 6, acute peritonitis. It is manifested as pain in the whole abdomen and can be accompanied by nausea and vomiting. 7, acute pelvic inflammatory disease: acute pelvic inflammatory disease caused by the combination of pelvic organ infection on the basis of gynecological diseases. It generally manifests as pain in the lower abdomen with fever.