Still, they have some breast tissue there, that is exactly the same in girls and boys when they are young and the bodies are not producing the hormones that will differentiate men and women and that will also make the women's breasts grow and the men's not.

Well, in some cases, even if it is indeed very rare, men are also affected by breast cancer due to their genetic inheritance or the environment or other causes. But, since this illness exists you should know how to recognize it, so you should know the symptoms of the male breast cancer in order to recognize it in the early stages when it can be treated easily.
Because the dimension of the male breasts is very reduced, this type of cancer is very easy to detect and notice. So when you see something unusual like a lump in the shape and size of a small button that usually appears right below the nipple, you should go to the doctor immediately even if you are a man. So this is the first symptom of the male breast cancer: the physical sign of a firm lump or swelling under the skin in the breast area. This is not hurting in the first stages of the cancer, but if it is left to develop it will become red in colour and all swollen and sore.
Another symptom is the inverted nipple. It may seem awkward, but the nipples look like they are oriented toward the interior of the breast. In the more advanced stages of the male cancer you will notice some more symptoms like the apparition of some axillary lymph nodes- some more firm "buttons" under the skin, this time situated in the area of your armpit. In some rare cases the nipples discharge a liquid, which is very unusual for a man and should trigger a serious alarm. Other symptoms of the male cancer may be the red spots on the skin in the breast area and also an infected sore lumps in the metastatic stages.
So, consider observing your body carefully for any sign or symptom of the disease even if you are a man. It is true that statistics say that only one in a hundred cases of breast cancer is that of a man, but it does happen and we should never assume it can't happen to us. You should also know that usually the left breast is affected in the cases of the male breast cancer, so make sure you touch and feel it more often.

Be alert and notice the problem from the early stages because you have more chances of curing this way. Nobody knows for sure what causes this terrible disease and nobody knows for sure if they are totally cured even after they have surgery and all the bad tissue is removed, but at least you increase your chances of survival and this is the most important thing.