When you have a deep cough that won't go away, the deep cough could be caused by acid reflux, allergies, respiratory infections or even COPD or other lung issues.
If the deep cough lasts longer than a few weeks you should see a doctor.
You should always see a doctor if you have a deep cough that won't go away, especially if you have other symptoms like coughing up of any blood, fever or shortness of breath.
Respiratory infections such as colds, flu or viral or bacterial infections can cause a lingering deep cough.
Allergies to dust mites, pet dander, pollen, mold etc can also trigger a deep cough or even just a cough as these irritants can irritate your airways.
Other things that can cause a deep cough that won't go away are postnasal drip, acid reflux, asthma and certain medications.
Certain medications such as ACE inhibitors can cause a persistent deep cough that won't go away as a side effect of the medication.
Asthma can cause a deep cough or a cough in general, especially during the night, along with wheezing and chest tightness.
Stomach acid that flows back into your esophagus can cause inflammation and irritation and lead to a deep and or persistent cough.
And postnasal drip causes excess mucus from your sinuses to drain down the back of your throat which can irritate your airways and lead to a deep cough.
In some rare cases the deep cough that won't go away could be a symptom of a much more serious health condition like lung cancer or heart failure.
You can try using a humidifier in your home or room to help add moisture to the air and use an air purifier which can help with breathing issues and can sometimes slow down or stop the cough if it's not caused by something more serious.
Taking some cough drops and drinking some warm tea with some honey can also help in some cases and staying hydrated by drinking plenty of water can also help with the coughing.
If the cough still does not go away you should see a doctor or if it gets serious enough and you're coughing up blood or are having trouble breathing you should seek medical attention and go to the ER.