The symptoms of unilateral breast hyperplasia manifest as cyclical swelling and pain in the breast, often occurring or worsening before menstruation and subsiding or disappearing after menstruation. Mild cases may not receive much attention from the patient, but severe cases can affect work and daily life. However, patients generally do not exhibit obvious cyclical changes. Some may experience swelling and pain in one or both breasts, similar to being pricked by needles, and this pain can extend to the shoulder, upper limbs, and chest-back area. A few patients may have nipple discharge, with the discharge being yellow-green, brown, or bloody. During physical examination, nodular lumps of varying sizes, which are firm but not hard, can sometimes be felt in one or both breasts. These lumps, which move slightly upon touch, have indistinct boundaries with the surrounding breast tissue but are not adherent to the skin or chest muscles. Sometimes the condition presents as an area of indistinct thickening.