Gynecomastia is generally related to hormones. Men with gynecomastia have higher levels of estrogen, i.e. the female hormone. The hormonal imbalance occurs naturally at specific time periods. Specifically, it often occurs during adolescence and in the old age when levels of testosterone hormone, i.e. the male hormone, are lower than estrogen hormone. Although these hormonal imbalances are temporary, they can lead to distress, particularly in young men.
Accumulation of fat in the chest area may also look like gynecomastia in obese people.
Some conditions and use of some medications can also be associated with gynecomastia.