Breast cancer is not “exclusive” to women. Men should also be vigilant if they notice an increase in the size of their breasts. Although breast cancer is rare in men, it is true that men can also develop breast cancer, and breast cancer is often diagnosed at a later age in men, with men being diagnosed at a later stage than women. Currently about 1% of male breast cancer patients in China are mostly middle-aged or older. Due to the small size of men’s breasts, even if they see a lump, men don’t think that a breast lump could be cancer, whereas most women will immediately assume the worst once they feel a lump in their breast. Male breast cancer tends to be more likely to invade the skin and chest wall, due to the fact that men have less breast tissue and can easily invade the surrounding tissues once there is tumor cell growth. It is important to note that even though men have a small chance of developing the disease, it is more likely to spread and is more dangerous than in women if the disease is not treated in a timely manner. Some people find breast lumps and don’t come to the doctor because they feel no pain or itch. Unbeknownst to them, most breast cancers are painless. In fact, the less painful a breast lump is, the more attention it should be given. Because painless breast lumps are one of the characteristics of breast cancer and breast fibroadenoma. If a man notices that his breasts have gotten bigger, he must pay more attention to the possibility of breast development and also the possibility of a tumor. Although tumors are less likely, they should not be paralyzed. Most men’s initial determination of whether or not they have breast cancer can be made by touching to detect a painless lump, but the disease is usually not diagnosed until a painful lump develops.