My son is 6 years old. Today morning he was playing in play area and once he jumped and that time his chest was started paining and he was not able to breathe also that time. After few seconds continuous pain comes down and he was able to breathe normal. But after that he is getting chest pain when he is taking chest pain when he is jumping or taking deep breath. We did chest x-ray and ecg both reports are normal. What could be the reason behind it please suggest ?