There are many reasons for menstruation failure, which are often caused by internal and external factors, such as pregnancy related diseases, uterine diseases, ovarian diseases, endocrine dysfunction, mental environment factors, etc. The menstrual period generally lasts for 2-8 days, with an average of 4-6 days. The reasons for the long duration of menstruation are as follows: 1. Pregnancy related diseases. Vaginal bleeding caused by pregnancy related diseases is regarded as menstruation, such as spontaneous abortion, ectopic pregnancy, etc; 2. Uterine lesions, such as submucous fibroids, endometrial polyps, can be accompanied by increased menstruation, prolonged menstruation, etc; 3. Ovarian disease, ovarian dysfunction, resulting in incomplete luteal atrophy or anovulation; 4. Endocrine factors, common diseases include polycystic ovary syndrome, hyperprolactinemia, etc; 5. Mental environment factors, such as mental tension, sudden changes in environment and climate.
