What Causes Discomfort In Throat While Swallowing?

I Have This Slight Irratation Inside My Mouth, I use To Have This Sore Throat Where It Hurt To Swallow And Cough, Now It's Gone And I have This Slight Side Irratation But It
s Not Like Very Bad Or Bad At All. Just A Bother To Sort Of Bother, it Feels Like It's Inside The Back Of My Mouth On The Side.