If a woman doesn’t have her period for more than a month, it may be due to endocrine disorders, pregnancy, cervical adhesions, taking medications and other reasons. 1. Endocrine disorders: excessive stress, excessive weight loss, prolonged strenuous exercise, ovarian hypoplasia, ovarian tumors and other causes of hypothalamic-pituitary-ovarian function axis disorders, causing hormone level disorders in the body, causing menstruation for more than a month without menstruation. 2. Pregnancy: Women in their childbearing years who normally have regular menstrual periods but do not have menstruation for more than a month need to consider pregnancy. After pregnancy, estrogen and progesterone levels continue to rise without hormonal withdrawal bleeding, causing women to not have menstruation for more than a month. 3. Cervical adhesion: abortion, curettage, cervical conical resection, cervical microwave treatment and other reasons can cause cervical mucosal damage, the formation of cervical adhesion, in severe cases, the menstrual blood can not be discharged, resulting in women do not have menstruation for more than a month. 4. Oral medication: prolonged use of birth control pills, oral rifampicin, chlorpromazine and other drugs, drugs inhibit the hypothalamus dopamine, caused by the pituitary gland secretion of prolactin increased, causing women not to have menstruation for more than a month. In addition, there are other factors that can cause a woman not to have a period for more than a month, it is recommended that when the menstrual abnormalities, timely consultation and examination in the hospital, to identify the cause of the disease, and then follow the doctor’s instructions to deal with the treatment.