How do doctors tell if a man has breast cancer?

Easier than in: A woman in most case, but an obese man may have flabby pectoral fat ... Asymmetry, palpable hard lump, and more common in older men. Usually a mammo is done, than a biopsy. Many boys develop gynecomastia during puberty - leave this alone. Some medication produces this, usually bilateral. Some testis tumors also produce. Go to a doctor to distinguish and find out.