My doctors told me it was related to my Fibromyalgia. Funny, FM is not included on this list http://symptomchecker.webmd.com/multiple-symptoms?symptoms=difficulty-swallowing%7Cdry-mouth%7Choarse-voice%7Closs-of-voice&symptomids=227%7C85%7C120%7C145&locations=7%7C7%7C7%7C7