If menstruation has ceased and breast pain and swelling occur, it is first necessary to determine how long it has been since the last menstrual period. If the expected period is delayed and breast discomfort arises, a visit to the hospital for a pregnancy test is recommended. For women of childbearing age who are not pregnant, it is considered normal for periods to shift slightly, typically by about a week. Medically, if menstruation has stopped for three consecutive months, it is referred to as amenorrhea. If there has been no menstruation for three months accompanied by breast pain and swelling, and pregnancy is ruled out, a breast ultrasound should be performed to check for any organic breast diseases. If no organic diseases are found, the possibility of galactorrhea-amenorrhea syndrome cannot be dismissed, and further medical tests and appropriate treatment at a hospital are necessary.