He have chest pain 4 days ago. If he cough or move on a certain way hurts him . Today he have back pain and he is not sure if it is related. He has no sign resp. superiors?
Cough with chest pain associated with the movement can sometimes be pleuritis, an inflammation of the lining of the chest. Does not seem to be heart. You can try with anti-inflammatory medicines to see if improvements. But if you have fever could be symptoms of pneumonia early and with chest pain associated with the effort is worrying.