Delayed menstruation symptoms of breast swelling, there are generally two possibilities: 1, if a woman’s menstrual cycle has been very regular, a sudden delay in menstruation and did not take contraception during intercourse, it may be pregnant, it is recommended to delay menstruation about a week to go to the hospital obstetrics and gynecology department to cooperate with the doctor to do a urine pregnancy test to diagnose whether the pregnancy, and if it is positive, you also need to do uterine ultrasound to confirm whether there is a pregnancy sac in the uterine cavity. Whether there is a pregnancy sac in the uterine cavity, to exclude ectopic pregnancy; 2, if you exclude pregnancy, breast swelling and other symptoms, it may be premenstrual syndrome, if the breast swelling and pain is not too serious and there is no breast lumps and other conditions, is a normal physiological phenomenon. It may be due to recent changes in the living environment, work fatigue, stress, nervousness or anxiety caused by endocrine disorders, generally do not need special treatment, the next period should be able to return to normal.