2. It’s Traced to Drug Abuse
WebMD downplays the condition as “normal” in many boys and men (70-percent of boys develop gynecomastia during puberty), but it does say that certain lifestyles can increase the risk of it.
The drugs that can cause the condition range from prescription anti-anxiety and depression medications to street drugs, such as marijuana and heroin, according to the source. Alcohol can also be a culprit, it adds.