Nipple pain and breast swelling are the same issues, both caused by mammary gland hyperplasia. Mammary gland hyperplasia mainly manifests as cyclic swelling and pain of the mammary glands, typically occurring or worsening before menstruation and diminishing or disappearing after menstruation. The mild cases get unnoticed by patients, while severe ones can impact daily life and work. However, some patients do not show obvious cyclical changes. It may present as swelling and pain in one or both breasts, similar to needle pricks, possibly extending to the shoulders, upper limbs, or thoracic-back area. A minority of patients may experience nipple discharge, and the condition can last for a long time, but symptoms usually disappear or diminish after menopause. During physical examinations, nodular lumps of varying sizes, which are tough but not hard, can sometimes be felt in one or both breasts. These lumps sometimes move when touched, and their boundaries with the surrounding breast tissue are not clear. However, they are not adherent to the skin or pectoral muscles. Sometimes it appears as a thickened area with unclear boundaries. The lumps often swell before menstruation and shrink afterward.