The enlargement of the mammary glands (gynaecomastia) in men is often accompanied by a high level of psychological stress. In most cases, excess fat deposits, either hormonal or genetic, are responsible, but sometimes the mammary tissue also begins to multiply. The consumption of certain medication can also cause gynaecomastia as a side effect. The consumption of anabolic steroids by recreational sportsmen and high-performance sportsmen can also result in gynaecomastia.