The first consideration for pain on the right side of the small abdomen is appendicitis. Metastatic right lower abdominal pain and appendix point pressure pain, rebound pain for it common clinical manifestations, often accompanied by nausea and vomiting. If appendicitis is ruled out, gynecological diseases are more likely to cause it, and the following causes can be considered: 1. adnexitis: the onset is usually for women after having sex, for one or both lower abdominal vague pain, often with a history of vaginitis, multiple abortions or a history of childbirth, pain is obvious after exertion, when active, not necessarily obvious pressure pain, anti-inflammatory treatment is effective, but easy to recur. 2. ectopic pregnancy. If it is about 6 weeks of early pregnancy, sudden pain in the abdomen with vaginal bleeding, the possibility of ectopic pregnancy is more likely to be considered. 3. dysmenorrhea. If there is pain during menstruation, it is dysmenorrhea. This condition is more common. For adolescent women, it is usually primary dysmenorrhea, and this condition is self-healing. There are also some women with dysmenorrhea that have secondary dysmenorrhea due to some disease, and these women need to go to the hospital for examination.4. Rupture of the corpus luteum of the ovary. A sudden rise in intra-abdominal pressure during external force, forceful coughing or defecation can prompt the rupture of the mature corpus luteum. 4. Intestinal cramps. If the pain in the abdomen has a bowel movement, or if the pain improves or disappears after a bowel movement, it may be intestinal spasm. If sudden abdominal pain, you need to immediately go to the hospital for examination, the doctor diagnosed to find the cause of symptomatic treatment, so as not to delay the disease.