If your period is not due and you have no pain in your abdomen, you should consider that it is related to impending menstruation and pregnancy-related illnesses. 1. The imminent onset of menstruation: for women who usually work under pressure or often stay up late, they are prone to endocrine disorders, so there will be an early or delayed menstruation, so if the patient has a breast swelling and pain, pain in the lower abdomen and other symptoms related to the usual menstruation before the onset of menstruation, then it means that menstruation is about to come. 2. Pregnancy-related diseases: As the level of estrogen and progesterone in the body rises after pregnancy, it will inhibit the function of the ovaries, which will lead to menopause, and if there is a vague pain in the abdomen, then we should be alert to the occurrence of ectopic pregnancy, pre-menstrual abortion and other diseases: (1) Ectopic pregnancy: due to the implantation of the gestational sac in the fallopian tube and other places, as the gestational sac increases in size and local tension, it will stimulate the local nerves and cause hidden pain in the abdomen; if the gestational sac continues to increase, it may lead to the rupture of the fallopian tube and cause severe pain in the lower abdomen. (2) Pre-eclampsia: pregnant women due to the lack of progesterone, which affects the normal development of the embryo is prone to pre-eclampsia and other adverse pregnancy, this time the patient will have a small amount of vaginal bleeding and abdominal pain and other discomforts. For women who do not have menstrual period, it is recommended to go to the gynecology department of regular hospitals to improve blood HCG, ultrasound and other related examinations, to clarify the cause of the disease under the guidance of doctors and active treatment.