I am a boy. I'm not fat. I am thin. Why does my breast seem to be getting bigger and feel very painful? Now they are like teenage girls. What is wrong with me?

After entering adolescence, the secretion of sex hormones begins to be active. At this time, there will be more or less some disorders, such as: boys have milk knots, nipple protrusions and nipple pain; While girls have moustaches and Adam's apple. After puberty, this phenomenon will disappear, so don't mind. However, some will leave these already formed youthful marks.

But you are thin, but your breasts are the same as those of a teenage girl. It should be caused by excessive estrogen secretion. I suggest you go to the endocrinology department of a regular hospital for six hormone tests.