An abnormal condition in which a person must keep the head elevated (sit or stand) to breathe deeply or comfortably (orthopnea) or wakes up suddenly in the middle of the night short of breath (paroxysmal nocturnal dyspnea).

Alternative Names

Waking at night short of breath; Paroxysmal nocturnal dyspnea; PND; Difficulty breathing while lying down; Orthopnea