I've been getting these wierd chest pains and I don't really know what the cause is. I'm going to be 16 in December and I started getting these pains around the beginning of the year. I exercise sometimes but I never had that pain after I'm done exercising. I usually get them at random times, like when I'm trying to sleep and I take in a breath of air, I get that pain and it hurts to the point where everytime I try to breathe my chest hurts.  Both my grandpas have died from a heart disease. One died when he was 40 and the other died when he was 80 and I'm not sure if i inherited a heart disease from them, and also I'm not sure if this can help out also but my uncle has died from cancer and I'm not sure if there is a connection with all of this. I would appreciate any help that you guys can give me on figuring out what is happening.