Sudden cessation of menstruation at the age of 43 may be related to unwanted pregnancy, or it may be caused by premature ovarian failure, diseases and other reasons. 1. Unintended pregnancy: especially if you usually have regular periods and do not take proper contraceptive measures when having sex, in this case, sudden stoppage of menstruation at the age of 43 is considered to be more likely to be an unintended pregnancy. 2. Premature ovarian failure: some 43-year-old women suffer from premature ovarian failure, resulting in ovarian dysfunction, which leads to a fluctuation in estrogen levels in the body, which may lead to a sudden cessation of menstruation, and may be accompanied by hot flashes, excessive sweating, and loss of libido, among other symptoms. 3. Diseases: For example, polycystic ovary syndrome, pituitary tumors and other diseases may lead to sudden menopause. Sudden cessation of menstruation at the age of 43 may also be caused by other reasons, it is recommended to go to a regular hospital as soon as possible, through the improvement of relevant examinations, a clear diagnosis of the causative factors, and then give targeted treatment and conditioning.