1, disease factors. If women suffer from certain diseases, including local inflammation of reproductive organs, tumors, intracranial diseases, endocrine disorders, or take drugs for a long time, it is easy to cause abnormal menstruation in women.

2. Endocrine disorder. Mainly the function of hypothalamus-pituitary-ovary axis is unstable or defective, which is easy to cause menstrual instability in women.