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What causes people to cough when they lie down?

Why is it that I cough when I lie down? It doesn't seem like I'm actually sick, but I find that I have a pretty hard wet cough every night. I struggled with asthma as a child ? could it have something to do with that?
Cough with lying down, medically termed orthopnea, is often associated with some degree of congestive heart failure. the accompanying symptoms of lower leg/ ankle swelling, a sense of abdominal fullness or early satiety as well as waking in the middle of the night very short of breath (a condition called paroxysmal nocturnal dyspnea) are further evidence that heart failure may be the cause of the cough. However, this is not a diagnosis that can be made based on one symptom and depending on your age and other risk factors (obesity, family history, diabetes, coronary artery disease), this diagnosis may be more or less likely. Another viable explanation for your symptoms is that this cough is attributable to your asthma, although a wet cough is not as common as a dry cough and wheezing for asthma flares. Finally, depending on the course of the symptoms (ie did the cough come on all of a sudden, perhaps in the context of other cold symptoms they may have now resolved) this could just be a lingering post infectious cough that is worse at night. if the cough persists or worsens, you should go see your doctor for a more thorough evaluation. hope this helps!
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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