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Hello! My name is***** to JustAnswer. I'm reviewing your question now, and will post back with the reply momentarily.
The most likely cause for it can be acid reflux. The other causes can be;
1) Epistaxis (nosebleed)
2) Erosion from mouth or throat.
You should get the following investigations for the evaluation;
a) Upper GI endoscopy
b) Chest x-ray
Exam by an ENT specialist is advised too.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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