Gynecomastia is not caused by extra fat deposits from being overweight. This is caused by additional breast tissue. There is another condition, called pseudogynecomastia, where there is fat accumulation in the chest, which is sometimes associated with being overweight or obese. Men who are very obese can have an increase in estrogen levels, which can cause their breast tissue to grow. You will not be able to feel dense tissue, only fat. Its main characteristic, both sides of the male breast are equally affected and swaying following your movements when you are walking or running. On the other hand, you might also want to learn how to get rid of puffy nipples.

Middle-aged and older men can also have breast tissue enlargement, which can be caused by aging (shifting hormone levels) or for other reasons, including:

Side effects of drugs

A report from the journal Expert Opinion on Drug Safety estimates that prescription, recreational and illegal drugs – such as antibiotics, heart medications, anti-anxiety drugs, AIDS treatment, tricyclic antidepressants, chemotherapy, and medications that treat stomach acid – cause at least 25 percent of cases of gynecomastia. This is because the content in certain medicines can interfere with your hormonal balance enough to fill your breasts.

Marijuana, heroin, and alcohol have also been linked to the incidence of large-breasted men. The use of anabolic steroids (common among bodybuilders) is most commonly associated with gynecomastia.

Other drugs that have been cited as triggers for gynecomastia include anti-androgens that are used to treat prostate cancer, calcium channel blockers, and gastric drugs such as cimetidine.

Herbal products that contain tea tree oil or lavender oil can also increase breast size. That’s because they have natural estrogen which can interfere with the normal levels of your body’s hormones.

Certain diseases

Sometimes, large breasts in men can be a side effect of other health problems outside obesity, such as hyperactive thyroid disorders (hyperthyroidism), kidney disease, or tumors in one of the glands that control your hormones.

Gynecomastia has been linked to conditions that ruffle the production of body hormones such as Klinefelter’s syndrome, liver disease, and pituitary insufficiency. Testicular tumors and trauma or infection of the testes can cause large-breasted men, as well as radiation therapy to the testes. Liver cirrhosis – often seen among people who abuse alcohol – can change hormone levels and cause gynecomastia.