My husband has Parkinson's (for about 10 years now). Recently, he has terrible coughing spells even when he is not eating. It is not so much a cough as a type of almost chocking even when he is not eating. He is on thickened liquids (because he had a small stroke last November) and he is on a soft diet. However, his coughing is not just limited to when he is eating. The fear is that he might asperate. His speech has also been affected. What is causing the coughing spells? He has been working with a speech therapist who has taught him how to swallow but this cough occurs even when he is not eating.
Another thing you want to check is the bacteria on the patient's tongue, having a white or yellow coating on the tongue especially toward the back can and often does cause coughing spells. This can be confused with an asthma attack, definitely check the tongue, especially toward the back. If there's a white coating on the patient's tongue, it needs cleaned, the patient may notice a huge improvement.
My husband is scheduled to see the speech therapist this week. It may very well be something in the house that is causing the cough. Tonight, at dinner, he only coughed when he attempted to drink a thickened liquid which it turned out was too thick. He has been working with this speech therapist for quite a while so we will see what she thinks about it. I will also contact his neurologist. Thanks for your advice!
A recommendation to another doctor might be in order, perhaps a pulmonary doctor, especially if the cough is productive. But if he seems to be choking, I'd start with a speech therapist.
I'd also call the neurologist (?) who treats for his Parkinson's.
There could be a variety of other issues as well - pollen in the air brought in when coming from outside, especially if he has allergic rhinitis and there are any cottonwood trees in the vicinity. They drop little balls of cotton for a few weeks in June and the miserable stuff gets in everything. I have to mask up just to mow the lawn. And once they get in the nasal or throat, they cause a lot of coughing.
It could also be an allergy to something in the house. Do you have a HEPA filter air cleaner that you can use? I use it when I clean - it helps collect the airborne dust particles.
But since he's on a dysphagia diet, has PD, there might be a change in his PD or something else might have developed. I wouldn't wait.