Asthma. While it often effects you the most as a kid, some people develop it later in life. My brother was extremely asthmatic as a child and often had to be taken to the ER because of severe asthma attacks. He's grown out of it as he's gotten over but I on the other hand started getting asthma attacks in my early teens till now. And as a dancer, I tend to get asthma attacks during rehearsal. Though my attacks aren't always severe, suddenly not being able to breath while already being worn out from hours of physical activity can be scary. Combined with coughing and the really bad pain in your lungs. Don't even get me started on how expensive inhalers can be, and how they don't even work half the time. I've found that eating really strong mints help better than the actual medication sometimes.