Women often have lower abdominal pain for many different reasons, which not only men can not understand, even with women’s friends and relatives can not understand their sudden pain, to introduce you to the main cause of several lower abdominal pain: a, ovulatory abdominal pain adolescent girls in ovulation, follicle rupture, follicular fluid on the peritoneum may have a certain stimulating effect, so they sometimes alternate between the left and right, monthly They sometimes have mild abdominal pain alternating from side to side, once a month. This is physiological, and it is mostly a one-sided lower abdominal pain, dull pain or pain like swelling, and some girls have a little vaginal bleeding at the same time, i.e. ovulatory bleeding, which disappears on its own after a day or two, usually not more than seven days. This kind of abdominal pain does not have any pathological changes, and the gynecological examination is completely normal, so it belongs to physiological abdominal pain and generally does not need to be dealt with. The dysmenorrhea is divided into two kinds of primary and secondary dysmenorrhea. Primary dysmenorrhea is common in adolescent girls, the reason is related to the level of prostaglandins in the body, cold, emotional and psychological factors without organic lesions, with the growth of age or after marriage and childbirth, generally can be self-healing. The common causes of secondary dysmenorrhea are endometriosis and adenomyosis. It is characterized by a gradual increase in pain, mostly cyclical, or vague pain in the lower abdomen during or after menstruation, which is aggravated before and after menstruation. In addition, it is often associated with infertility and menstrual disorders and often requires medication. This is caused by more bleeding in the corpus luteum, accompanied by sudden onset of abdominal pain in the lower abdomen or on one side, and in severe cases, shock may also occur. The rupture of the corpus luteum of the ovary occurs in the vast majority of cases on the 20th to 26th day of the menstrual cycle and may be accompanied by pain in the lower abdomen of varying severity. Before rupture, the ovarian corpus luteum is filled with blood and enlarged. When the ovary is affected by external or indirect external forces, especially when it is filled with blood during the premenstrual period, such as due to bowel movement, trauma, sexual intercourse, or strenuous activity, it may trigger the rupture. It is best to go to the hospital immediately after the onset of ovarian corpus luteum rupture, and not to abuse painkillers on your own to avoid masking the symptoms and affecting the normal diagnosis and treatment. 4. Ovarian cyst tip torsion or rupture This is because the tip of the cyst is long and large in size, and has no adhesion with the surrounding area and is highly mobile, so when it is affected by intestinal peristalsis or body position change, torsion occurs. When the ovarian tumor twists, the pain suddenly occurs on one side of the lower abdomen, which is persistent colic, often accompanied by nausea and vomiting; there may be obvious pressure pain and muscle tension in the abdomen; anal finger examination may reveal enlarged and painful attachments. The diagnosis can be confirmed by ultrasound examination. It usually requires emergency surgery. V. Pregnancy-related diseases Abdominal pain caused by pregnancy-related diseases can be seen in pre-eclampsia miscarriage, ectopic pregnancy (ectopic pregnancy), etc. In the case of ectopic pregnancy, for example, there can be vague pain or distension in the affected adnexal area. The pain manifestation varies with the amount and speed of bleeding. In the case of tubal pregnancy miscarriage, abdominal pain is often limited to the lower abdominal side, and blood accumulates in the rectal recess of the uterus, causing anal cramping; when tubal pregnancy rupture occurs, the amount and speed of bleeding is high, and blood rapidly spreads to the whole abdominal cavity causing pain throughout the abdomen. Six, acute appendicitis is a common lower abdominal pain in young girls, it belongs to the surgical disease, but needs to be distinguished from gynecological diseases. About 70% to 80% of patients start to feel pain in the upper abdomen or around the umbilicus, which shifts to right lower abdominal pain after a few hours. Simple appendicitis abdominal pain is confined to the right lower abdomen and can be persistent or paroxysmal. Suppurative appendicitis has increased abdominal pain, mostly paroxysmal and severe or distending. Necrotizing appendicitis starts with persistent throbbing pain, and the abdominal pain expands and increases in intensity. In the early stage, there is mostly mild nausea and vomiting of food, often accompanied by loss of appetite and constipation. Abdominal distention occurs with severe inflammation. The presence of metastatic right lower abdominal pain is characteristic of appendicitis. The disease is usually treated with surgical resection.