Nipple pain for a few days every month may be related to menstruation, ovulation, breast enlargement and other conditions. 1. Menstruation: Due to elevated estrogen levels, before menstruation, women will experience a series of uncomfortable symptoms, such as breast pain, nipple pain, grumpiness, abdominal discomfort and other symptoms, which will be relieved after menstruation. 2. Ovulation: A few women will experience symptoms such as nipple pain during ovulation due to changes in hormone levels, and the pain varies from person to person. 3. Breast Hyperplasia: If a woman has breast hyperplasia, she may experience breast and nipple pain at irregular intervals, accompanied by nipple discharge, breast hardness and other symptoms. The discomfort will be more obvious before menstruation due to the physiological cycle. Since there are many causes, it is recommended that patients seek medical examination in time to make a clear diagnosis.