I can't breathe in well during exercise, i have stridor and it feels like my throat is tightening. i often faint after exercise. what could this be?

Go to the doctor: It could be exercise-induced inspiratory stridor, which is caused by the vocal cords tightening during physical activity. It's often misdiagnosed as exercise-induced asthma. It can be treated. What concerns me is fainting after exercise. It's possible that the eiis is causing the problem, but it can also be the sign of a serious cardiac issue. You need to have this checked out by a doc.

Heart! Lungs!: Anyone having new/worsening shortness of breath with exertion/exercise should avoid such activities & be seen as soon as possible by his/her primary care physician.A number of problems can cause such symptoms, but poor lung function and cardiac disease (e.g.Coronary artery disease, congestive heart failure, valve dz) top the list.Heart attack could be looming, and medical attention asap is needed.

See doctor...: If you truly have stridor, this needs to be evaluated asap as this can be a potentially life-threatening symptom. See your doctor today!

Exercise asthma: Some people have exercise induced asthma. You should consult physician for examination and perhaps pulmonary testing and chest radiograph.