I'm a 16 male and and i feel something abnormal underneath my right nipple. what are some of the other symptoms of male breast cancer?

Hardness,bleeding: At your age this is very common to have enlargement of the glands under one nipple(gynecomastia) -- show it to your doctor. Cancer is hard, may ulcerate and bleed, retract nipple this is not you-- wrong age and fairly rare. Other causes of gynecomastia are anti ulcer meds, marijuana but the rest of the associated meds usually are old people drugs.

Relax. Another trick: Your body is playing. It's called gynecomastia. It can be one or both sides. Caused by testosterone; does not mean you are a girl. It can be embarrassing. But there is no reason to do anything and it is not cancer. Older men can get it as a side effect of some drugs. Male breast cancer is usually older men, or at least older than 25. You do not have breast cancer.