What Causes It?
Gynecomastia develops when estrogen and testosterone are not balanced. When there is a combination of increased estrogen with lowered testosterone, the male chest can develop glandular tissue originating at the nipple. The fat within the chest can enlarge. Most of the cases of gynecomastia result from imbalances during puberty.
In the adult, there are medical and social conditions that can cause sudden breast development in males. Tumors in the brain, testicles, or adrenal glands affect hormone production and cause breast development. Gym steroids can produce this condition. Social habits (smoking marijuana or excessive alcohol consumption) can cause breasts enlargement. Chronic diseases like renal failure and hyperthyroidism can lead to large breasts. Certain prescription drugs can affect testosterone and estrogen balance and include medicines for prostate hypertrophy, reflux, hypertension, anti-seizure, ulcer, and antidepressants.
Gynecomastia is a diagnosed by your medical history and your symptoms. If there is a sudden growth of the male chest, a medical workup is in order. Lab tests and radiological studies may be indicated. Gynecomastia is usually located on both sides of your chest even though there might be one side larger than the other.