It is important to take a thorough past medical history as Gynaecomastia can have a number of underlying causes.
Obesity - this is because being overweight can increase levels of oestrogen, which can cause breast tissue to grow. If you're overweight you're also more likely to have excess fat that can enlarge the breast tissue
Puberty - Many teenage boys have some degree of breast enlargement. Gynaecomastia at puberty usually clears up as boys get older and their hormone levels become more stable.
Older age - As men get older, they produce less testosterone. Older men also tend to have more body fat, and this can cause more oestrogen to be produced. These changes in hormone levels can lead to excess breast tissue growth.
Other causes may include side effects of medications, cannabis, alcohol misuse.
Breast reduction surgery is not usually available on the NHS
Male breast reduction surgery is not usually available on the NHS. You'll probably need to pay to have it done privately. In some cases, the NHS may provide male breast reduction if it's causing considerable pain or distress