It takes 2-3 months after weaning to have menstrual flow, and the absence of menstruation for one month is likely to be caused by non-disease factors or disease factors, which need to be treated symptomatically after clarifying the cause. 1. Non-disease factors 1. normal situation: just one month after weaning, the pituitary lactogen level is still high, ovarian function has not yet recovered, so you can not have a period, after excluding pregnancy can wait for observation; 2. pregnancy-related: one month after weaning is not yet menstrual, if there is a normal sexual life without contraception, you need to pay attention to exclude pregnancy. Second, disease factors 1, endometritis: endometritis is likely to lead to partial adhesion of the endometrium, but also low menstrual flow, can be given oral antibacterial drug therapy, such as penicillin, quinolones, etc.; 2, endocrine diseases: combined with other endocrine diseases, such as hypothyroidism, polycystic ovary syndrome, hypothyroidism requires oral drug therapy, such as levothyroxine sodium tablets, can be supplemented for the body thyroid hormone. Polycystic ovary syndrome requires lifestyle adjustment. For obese people, diet should be controlled and exercise should be increased to reduce body weight and waist circumference, increase insulin sensitivity and lower insulin and testosterone levels so as to restore ovulation and fertility functions.