The vague pain and fever on both sides of the stomach may be related to gynecological diseases, urinary system diseases, digestive system diseases and other reasons. 1. Gynecological diseases: If bacteria and other pathogens invade the female reproductive tract and cause infection of the fallopian tubes and ovaries, it will cause inflammation in the body, and the symptoms of vague pain in both sides of the stomach with fever will appear. 2. Urological diseases: such as bilateral ureteral stones, when the stone passes through the ureter, it can cause vague pain, if complicated by acute pyelonephritis, it can lead to fever. 3. Digestive system diseases: such as acute enteritis, if you eat unclean food, etc. caused by acute enteritis, may appear on both sides of the stomach hidden pain with fever phenomenon. It is recommended that people with vague pain in both sides of the stomach and fever go to a regular hospital in time to clarify the cause of the disease and carry out standardized treatment under the guidance of the doctor.