The causes of abdominal pain are complex, and there are often the following reasons for hidden pain in the left side of a woman’s abdomen: first, it is common to have adnexitis, tubal inflammation and pelvic inflammatory disease. The location of the pain is usually located in the lower left side of the navel, there can be pressure pain, in severe cases there can be rebound pain, can be accompanied by lower abdominal cramps and lumbar pain; some patients have a recent history of sexual life, menstruation or childbirth, can be accompanied by increased color of leucorrhea yellow, odor increase; second, is colitis or constipation, usually have a history of defecation, irregular stool, mainly constipation, there are patients with irregular stool. The pain is not related to the menstrual cycle, but only to the habit of defecation; thirdly, it is ureteral stone or urinary tract infection on the left side, which can show the clinical manifestation of vague pain on the left side of the abdomen, usually accompanied by urination, frequent, painful and urgent urination, and even hematuria can appear. Patients with left-sided abdominal pain should try to consult a doctor for diagnosis to avoid delaying the condition by self-treatment.