Regular vacation refers to menstruation. Delayed menstruation for the second time after abortion may be related to physiological factors such as mental stress and lack of sleep, as well as medication, pregnancy and endometritis. 1. Physiological factors: Physiological factors such as mental stress, lack of sleep, excessive weight loss, etc. may cause a woman to delay her second period after an abortion. 2. Medications: If a woman applies progesterone, dydrogesterone and other progestational drugs, it may affect the function of the hypothalamic-pituitary-ovarian axis and lead to the delay of the second period after abortion. 3. Pregnancy: If the second period after abortion is delayed for more than 7 days, and the recent sexual life without contraception, then we need to be vigilant that it is caused by another pregnancy. 4. Endometritis: the second delay in menstruation after abortion may also be related to the damage to the endometrium after abortion, bacteria into the wound infection, the patient’s common symptoms include lower abdominal pain, fever, leucorrhea, menstrual bleeding, menstrual period prolongation. There are many reasons for the delay of the second menstrual period after abortion, such as polycystic ovary syndrome, hyperthyroidism and so on. Women are advised to consult a doctor as soon as possible in order to clarify the cause of the problem and then follow the doctor’s instructions for treatment.