Women’s nipple itching before menstruation may be related to the increased level of progesterone in the body, progesterone will promote the growth of breast follicles, which will lead to breast development and enlargement, will also stimulate the nipple sensitivity to enhance the friction may lead to pain and itching. Women should wear loose underwear during this period to avoid localized squeezing and collision, and the itchy nipple sensation will be relieved after the onset of menstruation. If the nipple itch is still obvious or there are hard knots, lumps or overflow when touched, most of them are breast hyperplasia, breast nodules, mastitis, and you need to go to the hospital to do a breast ultrasound to avoid delaying the diagnosis and treatment of the disease, and women should pay attention to keeping the breasts clean and hygienic in the meantime.