The primary manifestation of mammary gland hyperplasia is cyclical swelling and pain in the breast, often occurring or worsening before menstruation and alleviating or disappearing after menstruation. Mild cases are noteworthy for the patient, while severe cases can affect daily life and work. However, some patients do not exhibit obvious cyclical changes; others may experience unilateral or bilateral breast swelling and pain or needle-like pain. The pain may extend to the shoulder, upper limbs, or shoulder-back area. A few patients may have nipple discharge. During physical examinations, nodular lumps of varying sizes, which are tough but not hard, can be felt in one or both breasts. Sometimes, these lumps are tender to touch, and their boundaries with surrounding tissues are unclear, but they do not adhere to the skin or chest muscles.