My friend has had shortness of breath for about a month now.
My friend has had shortness of breath for about a month now, and the doctors cannot find anything wrong with him. The doctors thought it was a b12 deficiency, but it still has not gotten any better. His lungs sound fine. His blood oxygen levels are fine. All his other levels are fine. He is overall a very healthy male who works out and eats pretty healthy. All I know is that he has been miserable dealing with shortness of breath on and off for the last month. He has had this happen to him before. Last time it lasted 4-5 months and went away on its own. I'm just genuinely concerned. Does anyone have any advice or ideas of what it could be?