<s>[INST] Hi, I am having trouble breathing.  I have had this once before, went to the doc- they said they dont really know.  (kind of said I have asthma).  Lately, it has been hard to breath, especially when I am sitting in the same spot for a long time.. like a car ride.  I never have trouble breathing while I am asleep or laying down.  What may it be?  I need answers bad! [/INST] HI, thanks for using Chat Doctor Difficulty breathing can be related to the lungs, heart, anemia, anxiety. Asthma can be identified by pulmonary function testing, this is a test that can show up respiratory conditions such as asthma. If it is negative then your difficulty is not related to asthma. Asthma would also more likely be associated with activity. A chest x-ray and also an ECG (to check the heart) may also be needed. I hope this helps </s>