Hi , Two days ago my son felt breathlessness all of a sudden. He is 10 years old. As he explained to me later that he felt completely suffocated and his mouth was frozen for a while. I immediately rushed him to hospital where they gave oxygen to him first . They also took X-ray and monitored saturation. He was found okay then and we got him discharged. He had slight nasal congestion . He also told the doctors that he was hit on the chest by his friend while playing , but it was not so hard. But he did not feel any suffocation then. May be , he felt it 5 min later. I am worried why he had this sudden breathlessness. Does he need any further tests ?