Hard to say: Silent reflux in the presence of post nasal drip is more commonly associated with cough and throat irritation. Not sure what you mean by throat / neck expansion. It doesn't sound like your throat swells suddenly which would be angioedema. Another possibility is an enlarged thyroid gland.
Answered 11/27/2017
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A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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