Women do not usually develop Montgomery’s nodes until they get their period. Montgomery’s nodes are formed when the ductal openings of the Montgomery’s glands in the areola area of a woman’s breasts bulge. Normally, when a woman is pregnant, her estrogen and progesterone levels increase and the Montgomery’s gland in the areola area enlarges, resulting in the formation of Montgomery’s nodes. Before menstruation, although the levels of estrogen and progesterone in a woman’s body also rise, which can stimulate the breast glands, it usually does not lead to the appearance of Montgomery’s nodes. If a woman develops Montgomery’s nodules in the areola before menstruation, she should seek medical attention to find out the cause of this phenomenon and take appropriate treatment measures.