Dyspnea that occurs when the patient is sitting up
Difficulty breathing when in an upright posture, usually relieved by lying down, is called platypnea. The word is from the Greek platus (flat) and pnoia (breath).
Orthopnea (Greek: ortho = straight + pnoia= breath) is shortness of breath (dyspnea) occurring when lying flat. The person is more comfortable sleeping propped up in bed or sitting in a chair. It is the opposite of platypnea. It is a symptom of left ventricular heart failure and/or pulmonary edema, asthma and chronic bronchitis, as well as those with sleep apnea or panic disorder.