why do i always feel out of breath?
What could be causing my shortness of breath? Shortness of breath can be caused by many things, including the following: If you are short of breath with a cough and/or fever, you may have a chest infection or pneumonia (say: ânew-moan-yuhâ). Less common causes of breathing problems are lung cancer, a blood clot in the lungs,air leakage around the lungs and scarring of the lung tissue. 1  Asthma. 2  Other lung diseases, including emphysema (say: âem-fa-see-maâ), which is a lung disease that is most often caused by smoking. 3  Heart failure. 4  Panic attacks.