Gynecomastia (Male Chest) | Causes and Risk Factors

In males, testosterone normally predominates and restrains estrogen-driven glandular expansion, whereas estrogen directly stimulates breast tissue proliferation. When estrogen rises or testosterone declines, this natural restraint is lost. Estrogen additionally suppresses luteinizing hormone, the pituitary signal directing testicular testosterone release, causing circulating androgen levels to decrease further. Hormonal shifts during infancy and adolescence frequently resolve spontaneously. In contrast, older men experience decreased testosterone synthesis coupled with higher body fat, which increases peripheral estrogen conversion. Furthermore, liver injury impairs hepatic estrogen degradation and elevates sex hormone–binding globulin. In alcohol-related liver disease, phytoestrogens and alcohol-induced testicular inhibition exacerbate this ratio imbalance.

During puberty, temporary shifts between estrogen and testosterone stimulate glandular proliferation in males. Clinical reports indicate pubertal gynecomastia is transient, with spontaneous regression occurring in over 70% of adolescents within one year. However, enlargement persisting beyond one year or after age 17 is less likely to resolve naturally, as progressive fibrosis develops within the glandular parenchyma and glandular activity decreases. Dr. Vishal Purohit notes that pubertal gynecomastia does not need medication and he does not prescribe medicines for the condition. Pathologic causes, such as underlying endocrine disorders or medication side effects, must also be considered if breast swelling does not settle.

Pseudogynecomastia involves chest enlargement primarily from excess fat rather than glandular proliferation, whereas true gynecomastia reflects hormonal imbalance. While weight loss reduces adipose tissue, exercise alone cannot eliminate hormone-driven glandular breast tissue. Rapid weight fluctuations also leave loose skin around the chest and alter contours, making fullness more noticeable. In Dr. Vishal Purohit's surgical practice, the target body mass index for gynecomastia surgery is within the normal range. While slightly overweight men may benefit from surgery without waiting, obese and massively obese men are not operated on because surgical risks are elevated and subsequent weight loss causes skin sagging that requires further correction.

Gynecomastia develops when estrogen rises relative to testosterone, as an increase in estrogen accompanied by a decrease in testosterone most often leads to breast gland growth. Anabolic steroids disturb this balance, and misusing them is a recognised cause of male breast enlargement. Furthermore, bodybuilders using supplements such as prohormone products introduce over-the-counter substances designed to convert into active hormones. These prohormones can increase estrogen levels, causing breast glands to become overactive and enlarge. In contrast, pure whey protein is an ordinary dietary protein without hormonal activity. Other substances linked to gynecomastia in literature include marijuana, heroin, amphetamines, and products containing lavender or tea tree oil.

Prescription medicines generally cause male breast enlargement by altering hormone levels, particularly the balance between estrogen and testosterone. Documented medications in the literature include the ulcer drug cimetidine, anti-androgens prescribed for enlarged prostate or prostate cancer, cardiovascular drugs including certain ACE inhibitors and calcium channel blockers, diazepam for anxiety, tricyclic antidepressants, some antibiotics, chemotherapy agents, HIV antiretroviral therapies, and opioids like methadone or morphine. Other substances such as steroids and amphetamines can also increase estrogen levels. Published studies note that surgical results are permanent in many cases, provided any triggering prescription medicine, drug, or weight gain is completely resolved after discussion with the prescribing physician.