Female patients with pain under the left side of the navel may be the following diseases: First, gastrointestinal disorders, patients who get cold in the abdomen or patients who eat cold food will cause pain under the left side of the navel, and there is often obvious pressure pain when pressed, it is recommended that patients improve routine stool examination. If the patient has left-sided adnexitis, there will be pain below the left side of the navel when pressed, often accompanied by abnormal leucorrhea, and the patient is advised to go to the gynecology department for timely consultation. If older women have pain under the left side of the navel, they should be alert to colon tumors, mainly colon cancer and rectal cancer, which are often accompanied by diarrhea and blood in the stool, and it is recommended to improve colonoscopy and tumor marker examination. Fourth, if colitis occurs, there will also be pain under the left side of the navel, often with diarrhea, it is recommended that patients improve blood tests, routine stool tests and colonoscopy.