The reasons why women have bloated stomachs during their periods are: a. caused by menstrual disorders. Lower abdominal swelling caused by menstrual disorders is the most common problem. Some women will have lower abdominal pain, general discomfort and other problems during the menstrual cycle, and in serious cases, the pain will be more severe. Second, some women with menstrual cramps should try not to rely on painkillers to solve the problem of menstrual cramps. More painkillers will lead to drug dependence and reduce their own absorption of drugs. In addition, regular dysmenorrhea may be caused by other diseases, that is, caused by tumors. Tumor may cause abdominal pain, abdominal distension, lumbar pain and falling sensation, which are usually persistent and will not disappear suddenly. 4. In addition, if the tumor twists and ruptures and bleeds, it will lead to sudden abdominal pain, which should be treated by timely surgery.