Boys are very thin but have large breasts may be caused by physiological factors, or testicular disease, cirrhosis of the liver and other diseases.
1. Physiological factors: transient gynecomastia occurs during puberty, and with the end of puberty, the enlarged gynecomastia will gradually subside and does not require special treatment.
2. Testicular disease: For boys with testicular inflammation and congenital testicular hypoplasia, the low level of androgen in the body can lead to a relative increase in the level of estrogen, which will lead to the development of mammary glands, resulting in the symptom that boys are very skinny but have big breasts.
3. Cirrhosis: After the liver function is damaged, the inactivation ability of estrogen decreases, resulting in increased levels of estrogen in the body, causing the situation of boys being very thin but with large breasts.
Boys are very thin but painless progressive enlargement of one or both breasts, or tenderness and lumps under the areola. If it occurs in pre-puberty or youth and also middle age, it is mostly considered abnormal. Further tests need to be used to rule out breast cancer or other neoplastic organisms. Treatment by oral medication or surgery is needed if necessary.
There are many other reasons why boys are thin but have large breasts, so you need to go to the hospital and ask the doctor to make a judgment, and to clarify the cause of the disease and treat the symptoms.