Because of the small size of the male breast, it is easy to detect when a small foreign body appears in the male breast. Therefore, compared to women, it is easier to detect the problem earlier when a lesion is found in the male breast as long as more attention is paid to it in general. You should go to the hospital for further examination as soon as possible when the following conditions appear in the male breast: 1. Lumpiness and swelling sensation. The main symptom of male breast cancer is that lumps in the breast often occur around the areola, with hard texture and unclear borders, and the surface is often not smooth and less mobile. 2. The skin of the breast is sunken and the nipple is sunken in, occasionally accompanied by nipple bleeding. Pain can sometimes be less pronounced, but any finding of nipple retraction and involvement of the skin should raise the alarm. 3. Enlarged lymph nodes. The most important feature of breast tumor is that it is easy to metastasize, so if you find swollen lymph nodes in the armpit for a long time, you should be especially careful.