It is not normal for a woman to have her period twice a month, the normal menstrual cycle is 21~35 days. The occurrence of two periods in a month may be due to endometritis or uterine fibroids, and you should go to the hospital for examination in time. 1. Endometritis: Endometritis refers to bacterial or viral infection of the lining of the uterus, and is usually caused after gynecological surgeries such as cesarean section and abortion. Patients mainly manifest abdominal pain, excessive vaginal discharge or abnormal menstruation. You can take cephalosporin or penicillin metronidazole and other drugs for treatment under the advice of the doctor, and if the condition is serious, you can undergo surgical treatment. 2. Uterine fibroids: Uterine fibroids are a kind of benign tumor formed by the proliferation of uterine smooth muscle tissue. Patients mostly manifested as abnormal menstruation, abdominal mass, leucorrhoea increase, lower abdominal swelling, etc. Generally speaking, asymptomatic uterine fibroids don’t need special treatment, and regular review can be done, but for patients with severe abdominal pain, surgery can be carried out. In addition, if the amount of two menstrual periods is not the same, it is considered that it may be caused by ovulation bleeding, if this is the case does not need to do special treatment, it is a normal physiological phenomenon, patients do not have to worry too much. Other pelvic inflammatory disease, inflammation of the reproductive tract may also be manifested as abnormal vaginal bleeding, mistaken for 2 menstrual periods, need to go to the hospital in time to standardize the diagnosis and treatment.