Hi doc My mother has extreme coughing problem from the past 2 months We have taken her to many doctors But no positive results One of the docs said that her lungs capacity has decreased and are only functioning 35%. And her coughing isn't stopping What should I do ? Is it something related to the heart ? What all tests should be conducted so as to know the root cause of the problem? Blood test ? Urine test ? What other tests should be conducted? Somebody pls here.