I have had these pains on an of all my life, more frequent when I was in my teens.The pain is sharp and comes on quick, I must breath very shallow very slow ,if I move position to much the pain is greatly enhanced. This pain comes with out any warning,no physical or mental stress of any kind. When this episode of pain happens it always feels as if I'm being stabbed in the heart,thats the best I can describe it. I started looking in to this recently when my 21 yr old son started experiencing the same thing,I have never mention this condition to him ,so I was wondering if it is hereditary.Any one out there whose children are exhibiting the same things?