What do they do a hospital if you are 12 and you have trouble breathing?

If you are twelve, at a hospital and have trouble breathing, the doctor at hand will see if anything is obstructing your breathing--checking your nose and chest area, ask if you have any Allergies, check for any allergy problems, check your pulse and blood pressure and then make the necessary diagnosis. Often, when this happens an allergy may be forming. But in any case, when this happens, be sure and get checked out...