Orthopnea
Breathlessness that comes on when lying flat and eases when sitting or standing up. It is a classic clue to heart failure — people often need extra pillows to sleep — but it can also occur with lung disease and severe obesity. New or worsening orthopnea deserves medical assessment.
What it means
Orthopnea is breathlessness that appears when lying flat and is relieved by sitting up or propping up on pillows. It happens because lying down shifts blood from the legs and abdomen back toward the chest, increasing the volume the heart and lungs must handle; if the heart is not pumping efficiently, this extra load causes fluid to back up in the lungs and makes breathing harder. It is one of the most characteristic symptoms of heart failure, and a practical clue is how many pillows a person needs to sleep comfortably, or whether they have taken to sleeping in a chair. A related symptom, waking suddenly at night gasping for breath (paroxysmal nocturnal dyspnoea), points the same way. While heart failure is the classic cause, orthopnea can also occur with significant lung disease (such as COPD), a large amount of fluid around the lungs, severe obesity, and diaphragm weakness. Because it so often reflects the heart, new or worsening orthopnea — especially alongside ankle swelling, weight gain or breathlessness on exertion — is an important symptom to have assessed.
Common causes
- Heart failure — the classic cause; fluid backs up in the lungs when lying flat.
- Cardiomyopathy and valve disease — through the same mechanism.
- Chronic lung disease (e.g. COPD) — can cause breathlessness worse lying down.
- Large pleural effusion — fluid around the lungs.
- Severe obesity — mechanical load on the chest when supine.
- Diaphragm weakness or paralysis — a less common cause.
Lab work-up approach
Orthopnea is assessed clinically alongside a history (including how many pillows are needed) and examination, with a chest examination, ECG and often a chest X-ray. The most useful blood tests are the natriuretic peptides NT-proBNP or BNP, which rise when the heart is under strain and help identify heart failure; troponin and kidney function and electrolytes are checked in context, and thyroid and blood count when relevant. An echocardiogram is central to assessing the heart. Mediora.AI can surface a raised NT-proBNP or BNP pattern from your results that supports a cardiac cause and warrants assessment, but breathlessness that is new, worsening or occurring at rest needs prompt in-person evaluation.
Tests Mediora.AI can interpret
Related conditions
Panels to consider
When to see a doctor
New or worsening breathlessness when lying flat should be assessed by a doctor, particularly when it comes with swelling of the ankles or legs, unexplained weight gain, or breathlessness on exertion, as together these point toward heart failure. Needing progressively more pillows to sleep, or waking at night gasping for breath, are the same warning and worth acting on. Seek urgent care for sudden severe breathlessness, breathlessness at rest, chest pain, or blue lips — these need emergency attention. Milder, longstanding breathlessness on lying down, for example with known lung disease or obesity, is still worth reviewing with your doctor. Mediora.AI helps by flagging a raised natriuretic-peptide pattern that fits a cardiac cause; new or worsening orthopnea is evaluated promptly by a clinician.