After painless abortion surgery to restore menstruation time is generally 30-40 days, a month without menstruation, it is possible that the endometrium is slow to recover, which is a normal phenomenon, of course, can not be ruled out the uterine cavity adhesions, re-pregnancy, endocrine abnormalities and other conditions resulting from the common causes and recommendations are as follows: 1, the endometrium is not fully recovered: painless abortion, the endometrium of some patients to recover slower or estrogen and progesterone level of fluctuations, affecting the normal growth of the endometrium, generally around 30-40 days to start menstruation. If you don’t have menstruation for 30 days after the operation, you can wait and observe for another 5-7 days, or use progesterone capsules, progesterone tablets and other medicines to regulate menstruation under the guidance of your doctor; 2. Uterine adhesion: after abortion, the surgical operation will damage the uterine lining and cause adhesion to the uterine lining, and then the menstrual function will be affected, and there will be menopause, and the adherence to the endometrium will be separated under hysteroscopy by hysterosalpingectomy so as to Re-pregnancy: If you have sex within one month after the abortion, there is a possibility of re-pregnancy, and you need to go to the hospital to confirm the diagnosis through blood, urine HCG and ultrasound. The uterine lining is still in the state of recovery one month after abortion, in order to avoid causing secondary damage, sexual intercourse should be prohibited one month after abortion; 4, endocrine disorders: the absence of menstruation one month after abortion may be related to endocrine disorders, such as hyperprolactinemia, polycystic ovary syndrome, thyroid dysfunction, etc., at this time you need to go to the hospital in time to see a doctor for the appropriate treatment for different causes of the disease. The treatment will be appropriate for the different causes of the disease. After abortion, it is necessary to supplement high quality protein, such as eating more eggs, milk, lean meat, soybean products, fish, shrimp and other foods, eat more fresh vegetables and fruits, to ensure that the nutritional balance of the diet, which can make the endothelium grow better, and also help to restore the normal menstrual cycle. If there is no pregnancy plan for the time being, you should take good contraceptive measures.