How can my doctor diagnose gynecomastia?

Examination: The diagnosis can usually be made by physical examination of the breasts. Sometimes mammography and ultrasound are helpful. Occasionally, biopsy is necessary.

Yes and more: Diagnosis of gynecomastia is only the first step. Identifying the cause is the next very important one. An experienced primary care physician will be able to conduct a complete workup and direct the next step in care.

Exam: Visual enlargement of the breasts constitutes gynecomastia. If they're enlarged the diagnosis is obvious.