If you stop menstruating for nine months and then come back, you may have physiological amenorrhea, and it may also be related to endocrine disorders and perimenopause. 1. Physiological amenorrhea: for example, during breastfeeding, women will experience amenorrhea, which is a normal physiological phenomenon and can usually return to normal on its own without special treatment. 2. Endocrine disorders: for example, polycystic ovary syndrome, pituitary tumors, etc., may lead to endocrine disorders, which will affect menstruation, resulting in menopause for nine months, which may also be accompanied by menstrual bleeding. 3. Perimenopause: Perimenopausal women, due to the decline in ovarian function, estrogen and progesterone secretion decreases, menstrual cycle disorders, may cause menopause for nine months again. There may be other reasons for menopause, so it is recommended to consult a doctor as soon as possible for a clear diagnosis, and then the doctor will guide you to carry out targeted treatments and adjustments.