However, when they reach puberty, increased hormone levels affect the further development of the breast tissue. Until boys reach their teenage years and puberty, their breast tissue is the same as that of girls. During this time, the breasts form small branching tubes (ducts) behind the nipple.

However, gynaecomastia can also be a mixture of both.īreast tissue develops while in the womb. True gynaecomastia (caused by an enlargement of breast tissue) is different from an increase in fatty tissue (known as pseudo-gynaecomastia). The area can be tender to touch or painful.

Gynaecomastia can affect one or both breasts. The symptoms and size of gynaecomastia can vary from a small, firm enlargement of breast tissue just behind the nipple to a larger, more female-looking breast. However, in nine out of ten cases it will get better by itself over time.

Two out of three teenage boys develop some degree of gynaecomastia. Gynaecomastia can often make teenage boys feel anxious and they worry about what it means for them. It’s a common, benign (not cancer) condition that mainly affects teenage boys and older men, but it can affect men at any age.Įven though gynaecomastia is common, it’s not talked about much because some people, particularly boys, find it embarrassing. Gynaecomastia is the enlargement of male breast tissue. What are the main causes of gynaecomastia?Ĩ.

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