Fibrocystic breast changes may occur in one or both breasts, where palpable, nodular lumps of varying sizes can be felt. These lumps are firm but not hard, and sometimes painful. The boundary between the lumps and surrounding breast tissue is unclear, yet they are not adherent to the skin or chest muscles, sometimes appearing as unclearly bordered thickened areas. Lesions are more commonly located in the upper outer quadrant of the breast but can affect the entire breast. The lumps may enlarge during premenstrual or postmenstrual phases, but they typically reduce in size postmenstrually. Diagnosis can be confirmed through breast ultrasound and mammography. Breast ultrasound typically indicates proliferative breast tissue, showing areas of uneven, low echogenicity and, in cases of cysts, anechoic areas.