Unexplained stomach pain in women is usually caused by three major systemic diseases: gastroenterological diseases, urological diseases and gynecological diseases. Gastroenterological diseases include acute gastroenteritis caused by excessive food or unclean food, and abdominal pain caused by acute cholecystitis or acute pancreatitis caused by overeating and other conditions. There can also be cases of appendicitis and peritonitis caused by too much activity in certain sports. Common diseases of the urinary system such as acute cystitis and acute pyelonephritis can occur in girls with small abdominal pain, and finally girls with unexplained stomach pain should also consider gynecological diseases such as dysmenorrhea, ovarian cyst torsion or ectopic pregnancy, ectopic pregnancy, etc.