If low menstrual flow occurs at the age of 42, it is necessary to identify the cause, which may be due to surgery or ovarian function decline, etc., resulting in reduced menstrual flow, which should be handled accordingly according to different causes, as follows: 1. If a woman has already given birth, the problem of reduced menstrual flow is usually not significant. If there is no desire to have children, as long as the menstrual cycle is more regular, it means that the hormone level is within the basic reasonable range and no special treatment is needed; 2. If you still have the desire to have children at the age of 42, you need to go to the hospital for examination and analysis of the reasons for the decrease in menstrual flow. If the decrease in menstrual flow is due to postoperative uterine adhesions, surgical treatment can be considered. If it is due to the decline of ovarian function, the patient needs to pay attention to rest and can also apply Chinese herbal medicine to regulate the treatment, or complete the fertility as early as possible. Therefore, if decreased menstrual flow occurs at the age of 42, the cause needs to be analyzed. If there is no pathological cause present, but simply a decrease in menstrual flow, and the patient has no desire to have children, no special treatment is usually necessary, and continued observation of menstrual flow is sufficient.