Breast engorgement and frequent urination may be caused by mammary gland hyperplasia, and we can diagnose it through breast ultrasonography or mammography. Mammary gland hyperplasia is currently believed to be related to endocrine disorders causing increased levels of estrogen. It primarily manifests as cyclical breast pain, often occurring or worsening before menstruation, and diminishing or disappearing after menstruation. Mild cases may not be significant to the patient, but severe cases can affect daily life and work. However, some patients do not show obvious cyclical changes, and symptoms may include one or both sides of the breasts feeling engorged or a tingling itch, possibly extending to the shoulder, upper limbs, or thoracic and back areas. A minority of patients may experience nipple discharge, which can be yellow or brown. The condition can last for a long time, but symptoms will automatically disappear or lessen after menopause.