Orthopnea, PND, and the Night Cough: Symptoms Your Heart Wants You to Notice

Some symptoms are easy to dismiss. You sleep with two pillows because that's just what you've always done. You wake up gasping at 2 AM and assume it was a bad dream. You cough for 20 minutes after lying down and chalk it up to allergies. Each of those, in the right context, can be one of the most useful early-warning signals heart failure produces.

I'm Dr. Damian Rasch, a cardiologist in Encinitas. This article walks through three symptoms that travel together when the heart is the cause: orthopnea, paroxysmal nocturnal dyspnea (PND), and the cough that shows up when you lie down. Patients often don't realize these point to the heart.

What Is Orthopnea?

Orthopnea means shortness of breath that gets worse when you lie flat and improves when you sit up. The classic measure is how many pillows you need to sleep comfortably. One pillow is normal. Two pillows is suspicious if it's new. Three or more pillows or sleeping in a recliner is highly suggestive of cardiac congestion.

Why does this happen? When you lie flat, the blood that was pooling in your legs and abdomen due to gravity all day suddenly has access to your central circulation. The right heart receives more return, the lungs receive more blood, and if your left heart can't keep up with that increased venous return, pressure backs up into the pulmonary capillaries. Fluid leaks into the lung interstitium. You feel short of breath.

A healthy heart handles this volume shift without symptoms. A failing heart, especially one with elevated left ventricular filling pressures, doesn't.

What Is PND?

Paroxysmal nocturnal dyspnea (PND) is the more dramatic cousin of orthopnea. The patient wakes from sleep, usually one to two hours after lying down, with severe shortness of breath. They sit up, often get out of bed, sometimes go to a window for fresh air. Relief takes 15 to 30 minutes. Some patients describe a sense of suffocation that's frightening.

PND has very high specificity for heart failure. When a patient describes a true PND episode, especially recurrent ones, the probability of heart failure climbs dramatically. The Framingham criteria for heart failure include PND as a major criterion.

The mechanism is similar to orthopnea but more prolonged. As fluid redistributes overnight, pulmonary congestion gradually builds until the patient's own respiratory control system triggers the alarm.

The Night Cough

Patients sometimes have a cough at night, especially when they first lie down or in the early morning hours, that's actually cardiac in origin. The mechanism is mild pulmonary congestion irritating the airways. This is sometimes called cardiac asthma when there's wheezing along with the cough.

Cardiac cough features:

- Worse when supine

- Often dry, sometimes producing frothy or pink-tinged sputum (a more serious sign)

- Associated with orthopnea or PND

- Improves with sitting up or with diuretic therapy

Cardiac cough is often misdiagnosed as asthma, GERD, or postnasal drip. The clue is its position dependence and its company.

When These Symptoms Show Up Together

The combination of orthopnea, PND, and night cough is much more specific for heart failure than any one of them alone. If you're experiencing all three, especially if you also have leg swelling, weight gain over days, or exertional dyspnea, get a cardiac evaluation promptly.

If you already have a heart failure diagnosis and these symptoms are new or worsening, that almost always means decompensation. Contact your cardiologist the same day. Often a brief diuretic adjustment resolves the symptoms before they require hospitalization.

Conditions That Mimic These Symptoms

Several non-cardiac conditions can mimic these symptoms.

Obstructive sleep apnea (OSA). Patients with OSA may complain of waking gasping or choking, but the episodes are typically multiple per night and tied to airway obstruction during REM sleep. Bed partner reports witnessed apneas, snoring, and restless sleep. Daytime sleepiness, morning headaches, and difficulty concentrating are clues. Sleep apnea and heart failure often coexist; both deserve evaluation if either is suspected.

Nocturnal asthma. Asthma symptoms often worsen at night due to circadian variation in airway tone. Wheezing, response to a bronchodilator, history of allergies, and personal or family history of asthma point this way. Asthma usually doesn't have a strong position dependence the way orthopnea does.

GERD with nocturnal reflux. Acid coming up the esophagus when supine can cause cough, throat clearing, and even mild bronchospasm. Heartburn, sour taste in the mouth, or relief with proton pump inhibitors point this way.

Postnasal drip. Allergic rhinitis or sinusitis dripping mucus down the throat at night causes coughing. Often associated with throat clearing and a stuffy or runny nose.

ACE inhibitor cough. A persistent dry cough is a known side effect of ACE inhibitors (lisinopril, enalapril, ramipril) in 5 to 20 percent of users. Switching to an ARB resolves it.

Anxiety. Panic attacks at night can cause sudden awakening with shortness of breath and a sense of impending doom. Usually accompanied by fast heart rate, sweating, and tingling. Tends to resolve over 10 to 20 minutes regardless of position.

The Workup

If orthopnea, PND, or a position-dependent night cough is on the radar, the standard workup is straightforward.

BNP or NT-proBNP. A heart-failure biomarker. NT-proBNP cutoffs are age-stratified: above 450 pg/mL under 50, above 900 between 50 and 75, above 1800 over 75. BNP above 100 pg/mL is suggestive, above 500 highly specific. Normal levels make heart failure unlikely as the cause of dyspnea.

Chest X-ray. Looks for pulmonary congestion (Kerley B lines, cephalization of vessels), cardiomegaly, and pleural effusion.

EKG. Checks for arrhythmia, prior MI, left ventricular hypertrophy.

Echocardiogram. The single most important test. Measures ejection fraction, diastolic function, valve disease, chamber sizes, and pulmonary pressures.

Sleep study. If OSA is suspected based on snoring or daytime symptoms.

Pulmonary function tests. If asthma or COPD is suspected.

When to Escalate Care

Call 911 for:

- Severe shortness of breath at rest, especially with chest pain

- Cough producing pink, frothy sputum

- Orthopnea or PND with confusion or extreme fatigue

- Sudden severe symptoms different from your baseline

Contact your cardiologist same-day for:

- New orthopnea (you didn't need extra pillows before, now you do)

- New PND episodes

- Worsening of existing orthopnea (more pillows than usual)

- Weight gain of 3 to 5 pounds over a few days with any of these symptoms

- New night cough with leg swelling

Schedule a clinic visit within 1 to 2 weeks for:

- Long-standing mild orthopnea you're now wondering about

- Position-dependent cough without other symptoms

- Mild fatigue or dyspnea that you suspect might be related

Common Patient Questions

I've slept on two pillows my whole life. Is that orthopnea?

Probably not. Lifelong pillow preference is just preference. Orthopnea matters when it's new. That includes when you used to sleep on one pillow and now need two or three, or when you can no longer sleep flat at all. The change is the signal.

My husband says I gasp in my sleep. Is that PND or sleep apnea?

It's worth sorting out, because the workup is different. PND is usually one event per night, an hour or two after you've fallen asleep, with the patient sitting up and taking time to recover. Sleep apnea typically involves snoring, multiple events per night, and the patient may not fully wake up. Both are common; both deserve evaluation. A sleep study often answers it.

I have heart failure and I started a new medication. Now I'm coughing a lot. Could that be the medication?

If you started lisinopril or another ACE inhibitor, persistent dry cough is a well-known side effect (5 to 20 percent of patients). Switching to an ARB or to sacubitril/valsartan (Entresto) usually resolves it. Don't stop the medication without talking to your prescriber.

My BNP is normal but I still have orthopnea. Could it still be cardiac?

Yes, occasionally. BNP can be artifactually low in obese patients and in patients with very chronic, well-compensated HFpEF. It can also be normal in valvular disease that isn't yet causing elevated filling pressures. If clinical suspicion is high, an echo and right heart catheterization are reasonable next steps.

I sleep upright in a recliner because that's the only way I can breathe. Is that bad?

Yes, in the sense that needing to sleep upright is a strong indicator of significant cardiac congestion. This is NYHA Class IV heart failure if cardiac, and warrants urgent evaluation and probably aggressive diuresis. Don't normalize this. Get evaluated.

Can heart failure cause asthma-like wheezing?

Yes. Cardiac asthma is wheezing from peribronchial fluid in heart failure, easily misdiagnosed as bronchial asthma. The clue is the company it keeps (orthopnea, edema, exertional dyspnea) and the response to diuretics rather than bronchodilators.

I have GERD and I cough at night. How do I tell if it's also my heart?

Pure GERD cough usually responds to acid suppression and elevation of the head of the bed. Cardiac cough usually doesn't respond to those measures and is accompanied by other heart-related symptoms. If acid suppression doesn't fix it, get a BNP and echo.

A Final Note From Me

Orthopnea, PND, and the position-dependent night cough are some of the most reliable early signs of heart failure. They're also some of the most ignored. Patients tell themselves they sleep on more pillows now because they're getting older, or they cough because of allergies. Sometimes that's right. Sometimes it's the heart asking for attention.

If you're noticing any of these symptoms and they're new or progressing, mention them at your next visit. The workup is straightforward, and identifying heart failure early dramatically changes the trajectory. Modern heart failure treatment in 2026 (the four pillars: beta-blocker, ACE inhibitor or ARB or sacubitril/valsartan, MRA, SGLT2 inhibitor) extends life and improves how people feel. The window to start it is the moment we recognize the diagnosis.

References

1. Heidenreich, Paul A., Biykem Bozkurt, David Aguilar, et al. "2022 AHA/ACC/HFSA Guideline for the Management of Heart Failure." Circulation 145, no. 18 (2022): e895-e1032.

2. McKee, Patricia A., William P. Castelli, Patricia M. McNamara, and William B. Kannel. "The Natural History of Congestive Heart Failure: The Framingham Study." New England Journal of Medicine 285, no. 26 (1971): 1441-1446.

3. Wang, Charlie S., J. Mark FitzGerald, Michael Schulzer, Edwin Mak, and Najib T. Ayas. "Does This Dyspneic Patient in the Emergency Department Have Congestive Heart Failure?" JAMA 294, no. 15 (2005): 1944-1956.

4. Tanabe, Tsuyoshi, Henry J. Rozycki, Soichiro Kanoh, and Bruce K. Rubin. "Cardiac Asthma: Transudative Pulmonary Edema vs. Bronchial Hyperresponsiveness." Postgraduate Medicine 124, no. 4 (2012): 63-71.

5. McEvoy, R. Doug, Nick A. Antic, Emma Heeley, et al. "CPAP for Prevention of Cardiovascular Events in Obstructive Sleep Apnea." New England Journal of Medicine 375, no. 10 (2016): 919-931.

6. McDonagh, Theresa A., Marco Metra, Marianna Adamo, et al. "2021 ESC Guidelines for the Diagnosis and Treatment of Acute and Chronic Heart Failure." European Heart Journal 42, no. 36 (2021): 3599-3726.

7. Januzzi, James L., Carlos A. Camargo, Saif Anwaruddin, et al. "The N-Terminal Pro-BNP Investigation of Dyspnea in the Emergency Department (PRIDE) Study." American Journal of Cardiology 95, no. 8 (2005): 948-954.

8. Gibbs, Charles R., Russell C. Davies, and Gregory Y. H. Lip. "ABC of Heart Failure: Investigation." BMJ 320, no. 7228 (2000): 297-300.

Published on damianrasch.com. The above information was composed by Dr. Damian Rasch, drawing on individual insight and bolstered by digital research and writing assistance. The information is for educational purposes only and does not constitute medical advice.