While gynecomastia is mostly seen in adolescents or men above the age of 50, its development can occur anywhere from birth onwards. In most cases, the levels of estrogen (female hormone) supersede testosterone (male hormone) levels. There are numerous potential causes of gynecomastia.
Obesity and lack of exercise can promote the overgrowth of tissue in the male chest. Hormonal imbalance and metabolic dysfunction are also reasons for gynecomastia. The intake of alcohol or anabolic drugs can aggravate the condition. Diseases like cancer or liver failure are a few other root causes of growth of breast tissue in men.