What do lumps in the chest mean? gynecomastia or breast cancer?

Either one + others.: Most palpable female breast lumps are caused by either normal fibroglandular tissues, fibrocystic change, cysts, fibroadenomata, lipomas, focal mastitis (infection), or cancer.Gynecomastia by definition is male breast enlargement, usually from benign causes. It may be unilateral or more frequently bilateral. However, the are several thousand male breast cancers diagnosed each year.

Either: Masses in the chest could be gynecomastia or breast cancer. Best to be evaluated by your physician for diagnosis and treatment recommendations.