Hello,
Are you taking any new medications?
You may want to make an appointment with an ENT (Ear, nose & throat) specialist for an accurate diagnosis. You may have a post nasal drip or sinus infection which is a very common cause of tasting salt.
Here is some info, let me know if you have questions.
http://www.mayoclinic.com/health/salty-taste-in-mouth/AN01411
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