What causes gynecomastia?
Gynecomastia is usually caused by changes in hormones at birth, puberty or as part of aging. Gynecomastia may be caused by changes in the balance of 2 hormones: estrogen and testosterone. In adults, the balance of hormones may be affected by:
- Aging
- Disease, such as:
- Tumors of the adrenal glands, testes or pituitary glands
- Hyperthyroidism
- Hypogonadism
- Kidney disease
- Liver failure
- Medicines, such as:
- AIDS medicines
- Anti-anxiety medicines
- Antibiotics
- Chemotherapy
- Some medicines for cardiovascular disease
- Tricyclic antidepressants
- Ulcer medicines
- Illegal drugs, such as:
- Anabolic steroids
- Amphetamines
- Heroin
- Marijuana
- Alcohol
Written by familydoctor.org editorial staff
Reviewed/Updated: 12/10
Created: 09/00