<s>[INST] Non smoker, 44 yr old female. Last 2 years have had difficulty exercising and feel tired. Frequent light cough and feels weird when I exhale. Pulmary fibrosis killed my father and mother has asthma, however pulmonary tests show nothing. I am concerned. I know my lungs are not right [/INST] If the pulmonary function test is normal and you have a very light cough, I believe there must be nothing wrong with the lungs. If you are obese it could be related to that however if not then u need to rule out any cardiac problems. </s>