Gynecomastia is breast development that occurs in males. It can happen at any age and for a number of different reasons.
Breast Growth in InfantsBreast growth (one or both breasts) is very common in newborns and is, in most cases, the result of exposure to the mother's hormones via breast milk. Gynecomastia lasts for a few days or a couple of weeks. Sometimes, in rare cases, it can continue up until the child is 2 years old.
Talk to your pediatrician if you notice any seemingly-abnormal breast development in your infant. They will be able to offer information and advice and monitor the situation.
Breast Growth in Male TeensDuring the teen years, the hormonal changes of puberty can sometimes cause one or both breasts to become enlarged and tender. While embarrassing, this condition usually disappears after a few months.
Your family doctor can make a firm diagnosis and monitor progress. In very rare cases, surgery can be used to remove breast tissue if the breasts are abnormally big and causing psychological problems.
Male Adult Breast GrowthIncreasing breast size in adult males is almost always due to weight gain, which results in fat laying down over the pectoral region. If male breasts suddenly increase in size and/or become painful, however, then medical intervention is required. In old age, hormonal imbalances may be the cause.
There are a few medical conditions, some of them requiring treatment, that can cause gynecomastia, so an accurate diagnosis will tell you and your doctor if you need to treat an underlying condition.
Possible medical causes of male adult breast growth include kidney failure, chronic liver disease, tumors, genetic disorders such as Klinefelter's syndrome, side effects of some therapeutic drugs, and exposure to androgen hormones taken by some bodybuilders.