Can heart failure be cause by a mild to moderate hit to the chest in a football game.i got a chest xray that is clear.ihave slight shortness of breath?

Unlikely.: That would not be a mechanism for heart failure. At the worst, you could get a pulmonary or cardiac contusion, which would cause pain and shortness of breath, but I would think that would need to be quite a severe shot to the chest to cause that - not a mild to moderate one. Usually you'd have rib fractures with that type of impact. If it persists, get to ED right away.

Not likely: Extremely unlikely- would seek out other causes for your shortness of breath.