My husband has a painful lump under his left nipple. ultrasound & mammogram showed not cancerous. doc said could be from antacids? how?

Gynecomastia : Gynecomastia is the benign enlargement of breast tissue in males. Gynecomastia is the most common abnormality in the male breast. Clinically, it presents as a soft mobile tender subareolar mass. There are many causes of gynecomastia including hormonal (declines in testosterone level), medication side effect (cimetidine for example - antacid known to cause it!), systemic conditions and idiopathic.

Gynecomastia: The other physicians are correct. Cimetadine is famous for causing this, and some men just get it. Chances are that your husband and you would like it removed; this is a simple surgical procedure that can be done in the office.

Some antacids: are associated with gynecomastia, which can cause the symptoms your husband is having.