The most common causes of pain in the lower right side of the small abdomen in women are as follows: 1. Gastrointestinal causes, possibly gastrointestinal inflammation or gastrointestinal dysfunction, and in severe cases, possibly appendicitis, usually appendicitis has pressure pain or rebound pain at the point of McKay, but chronic appendicitis has episodes and vague pain from time to time, which is sometimes difficult to diagnose. 2. Ureteral stones are possible, usually this condition has sudden onset and pain, and sometimes vague pain, The pain is more obvious and sometimes vaguely painful, but the nature of the pain is mainly stabbing or colic when it suddenly attacks and hurts, sometimes accompanied by pallor, cold sweat, or even vomiting. 3. Gynecological diseases, such as ovarian cyst torsion, ectopic pregnancy, dysmenorrhea, endometriosis, etc., can cause pain in the right lower abdomen.