Shortness of Breath: Causes, Chest Pain & Health Risks

What causes shortness of breath when walking, biking, or lying down? From low blood oxygen levels to vitamin insufficiencies, identifying the triggers for respiratory distress in teens and the elderly is essential.

What Are the Causes of Shortness of Breath on Exertion?

Published Aug,14 2017 | By Matthew Fox, MD

Shortness of breath on exertion has many possible causes. Most commonly it is due to problems with the lungs, airways or heart. Other problems may cause shortness of breath on exertion as well.