A woman’s normal menstrual period usually lasts from 2 to 8 days. If it lasts less than 2 days, it is called short period; if it lasts more than 8 days, it is called long period, and the cycle of menstruation usually lasts from 21 to 35 days. 1. Short periods. First of all, blood and urine HCG should be checked to rule out the possibility of pregnancy. Female sex hormone six and thyroid function should be checked to exclude endocrine diseases such as polycystic ovary syndrome, hyperprolactinemia, thyroid dysfunction, and even premature ovarian failure. Various diseases have their own clinical features and hormone expression characteristics, and should be identified and handled. 2. Prolonged menstruation. It is often caused by organic lesions, such as uterine fibroids, endometrial polyps, endometrial thickening, submucosal fibroids, etc. Surgery is often required for lesions. Prolonged periods also usually require a curettage test, except for endometrial hyperplasia or even endometrial cancer. Short or long periods need to be diagnosed by ultrasound examination in the hospital, as long as the cause is identified and treated, the menstrual situation can be improved.