According to andrology experts, male breast enlargement is medically called male breast hypertrophy, which usually occurs around puberty and old age. Pathological manifestations are glandular duct hyperplasia without acinar hyperplasia, which can be generally divided into primary and secondary. Below, we will give you a detailed introduction. Primary male breast hypertrophy is usually caused by adolescent boys and elderly men, mainly caused by a temporary increase in endogenous estrogen or a decrease in androgen, which often subsides on its own. Secondary male breast hypertrophy is common in liver diseases, testicular diseases, adrenal diseases, thyroid diseases, diabetes, urogenital or nervous system tumors, prostate diseases, or long-term use of certain drugs for other diseases. In addition, hermaphroditism and congenital testicular dysplasia can also lead to male breast hypertrophy. Chinese medicine believes that a man's breast belongs to the kidney and his nipple belongs to the liver. If his mood is not harmonious, he will be furious and hurt his liver, leading to stagnation of liver qi. However, if he is depressed for a long time, he will turn into fire, burn the body fluids of his liver and kidney, damage his liver function, and have low detoxification function, so that excessive estrogen in the human body can not be inactivated in the liver, but will act on the target organ breast, or he will be old and weak, unable to recover after a long illness, deficient kidney and liver, and unable to maintain liver wood. Or the congenital endowment is insufficient, and the essence and blood can't support Chong and Ren, which leads to the imbalance of Chong and Ren, or exogenous pathogenic factors damage the liver, which can lead to the dystrophy of meridians, stagnation of qi and blood, blood stasis and phlegm coagulation, blocking meridians, and leading to the occurrence of male breast hypertrophy.