Hi, Im 25 yrs old, 195 pounds, in average shape. This year, I haven't been playing outdoor games or been that physically active yet. But yesterday, I was playing basketball in the evening when it was a little cold. After playing for 1-2 yours I felt fine. But, when I got home I felt short breathed. There was also a whistling sound in my breathing. Very less coughing, but when I do, I taste blood. Could this be simple inflammation of blood vessels in the lungs? Haven't coughed up any mucus yet.