There are many cause: You are twenty years old and having shortness of breath.We can not tell you on this site what is causing your symptoms you need to be checked with detailed history and physical examination and some other tests including blood;urine, and if indicated xray chest, ekg and pulmonary function tests it may be from anemia, pulmonary condition like asthma;others and heart problem so make an appt and get chec.
Answered 5/16/2018
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