It can also be caused if your salivary glands, which are the glands that keep your mouth, tongue and throat
moist, are not working well and this allows your throat
to become very dry. It is not enough for the doctor to examine your throat, just by looking in your mouth. You should see an ENT specialist who can use an instrument called a fiberoptic laryngoscope to examine all areas of your nose and throat.
This exam would be important to both find the cause and to give you peace of mind.