Gynecomastia is an endocrine system disorder that causes an enlargement in the size of male breast tissue.
Other causes of the man boobs may be due to:
• Certain medications: Some antibiotics, heart medicines, heartburn medications, anti-anxiety drugs, antidepressants, and other medications
• Drugs and Alcohol: Marijuana, heroin, amphetamines, steroids, and excessive alcohol
• Medical Conditions: Overactive thyroid, kidney disease etc