Not having a period after 40 days of abortion may be caused by physiological factors such as pregnancy, or by diseases such as uterine adhesions and hyperthyroidism. It is recommended that you visit a doctor to find out the cause and treat it under the doctor’s guidance. 1. Physiological factors: Pregnancy after abortion can also lead to the patient not having menstruation after 40 days of abortion. 2. Uterine adhesion: Uterine adhesion is considered to be caused by endometrial trauma, infection and other factors. Patients may experience symptoms such as abnormal menstruation, decreased menstruation, amenorrhea, etc., which may cause patients to experience the symptom of no menstruation after 40 days of abortion. 3. Hyperthyroidism: The main symptoms of patients with hyperthyroidism are emaciation, prolonged menstrual cycle and amenorrhea. If the patient has hyperthyroidism, it will be manifested as 40 days after the abortion and no menstruation. When the patient has the symptom of no menstruation after 40 days of abortion, it may be caused by physiological factors and does not need treatment. If it is caused by disease, it is recommended to consult a doctor in time to identify the cause of the disease and follow the doctor’s instructions for treatment.