It is not normal to stop menstruation for six months and then come back, which may be due to endometritis, polycystic ovary syndrome, hyperprolactinemia and other diseases. 1. Endometritis: It is usually caused by endometrial trauma after childbirth, cesarean section, abortion, which leads to pathogen infection and is related to poor sexual hygiene, lower genital tract infection, direct spread of inflammation in neighboring organs and other factors. Patients often have lower abdominal pain, fever, abnormal vaginal discharge, menstrual abnormalities, and some patients may also show menopause for six months and come back. Some patients may also have symptoms such as lack of appetite, rapid heart rate, chills and high fever. 2. Polycystic Ovary Syndrome: The cause of this disease is still unclear, and it is mostly considered to be due to the combined effect of genetic and environmental factors. Patients often appear menstrual disorders, hirsutism, acne and other symptoms, some patients may also be manifested as menopause for six months and then come back. And patients may also be accompanied by obesity, infertility, emotional disorders and other conditions. 3. Hyperprolactinemia: the usual pathology is due to pituitary disease, hypothalamic disease, chronic renal insufficiency and other diseases, and also related to stress, trauma, drugs and other factors. Patients often have symptoms such as menstrual disorders, amenorrhea, breast overflow, etc. Some patients can also be manifested as menopause for six months and then come back. Some patients may also experience drowsiness and abnormal appetite. There may be other reasons for six-month menopause, so it is recommended that patients consult a doctor to find out the cause of the disease in time and treat it appropriately.