Never Suppose of Heart Attack

I have a friend that never suppose of heart attack, but actually he has the one of the characteristic below. He was very fast feel hard to breath, and have overweight body. His body turn to blue may because of his blood vessel break because can't stand to receive of blood pressure. When he doing a little hard of activity, he then collapse and died. Heart attack can happen cause to several initial characteristic.

1. Because of he/she has heart problem disease
2. Because of he/she has heart symptom problem
3. Because of he/she has overweight
4. Because of he/she has over activity
5. Because of he/she has overdose

The first of two on the above can make a heart attack to the one that initiate by the unsuitable condition and because he/she has abnormal heart condition.  But the three of the above causes can because of wrong activity that make the heart failure, and make she/he die.