There are many physical disorders that may cause shortness of breath. Shortness of breath happens when the body's needs exceed the ability of the lungs and chest muscles to deliver oxygen. If it occurs often over a long period, it can put a strain on the heart and lungs. There are many possible causes. Shortness of breath can also be caused by heart disease or heart failure.
Some heart problems cause breathing distress only when one is lying down or sleeping.
It usually stops when the person sits up or stands, but is a sign of a serious problem. If you have a hard time breathing or a marked change in exercise tolerance, consult your healthcare provider. If you are a smoker, stop now. All rights reserved. Information in this document is subject to change without notice.