Hello~Post-nasal drip from a sinus infection or allergies could also be to blame. The mucus from your nose can build up in the back of your throat, If it mixes with the saliva in your mouth, it can cause a salty taste. I have read that this strange sensation is actually quite common.
Here are some other reasons for having the salty taste:
Dry mouth
Dehydration
Oral bleeding
Oral infection
Acid or bile reflux
Nutritional deficiency=Taking a good, high potency B vitamin will help as will extra Vitamin C.
If it continues, I would see either your dentist or GP.
I hope you feel better soon.