Needle-like pain in the nipple is a common problem for young or middle-aged women, and there are several factors that need to be considered to cause the pain. First, after the first menstrual period, the hormone levels in the body change each month as the menstrual cycle changes, and elevated estrogen levels before or during menstruation can lead to breast enlargement, resulting in pain. Secondly, irritation due to breast nodules or lumps in the breast. This type of pain does not change with the menstrual cycle and will gradually increase as the nodules or lumps grow. Third, it is considered to be caused by long-term friction. Since women need to wear underwear, if the underwear is too tight or made of uncomfortable materials, it may lead to skin friction and breakage, and improving the tightness of underwear or clothes suitable for your skin type will improve the symptoms.