As sqad said there can be a few reasons for this,in my case about a year ago i had the same thing,the taste of salt was so strong it was putting me off food and had a constant salt taste throughout the day,anyway I went to my g.p and a quick examination later he diagnosed a sinus infection,I had a cold a few weeks previous to this and he said(this is gross)that the sinus's were dripping fluid from my nose and surounding area to the back of my mouth causing the salty taste....anyway anti biotics sorted it out within the week.....get to your doc alliegid,dont suffer.