Orthopnea means you have shortness of breath when you lie down that goes away as you sit or stand up. It usually comes on over time, but sometimes it can happen all of a sudden. Orthopnea is a sign of ...

An airway obstruction happens when you can't move air in or out of your lungs. It could be because you inhaled something that's blocking your airway. Or it could be caused by disease, allergic ...