hello thank you for trusting HCM dear after surgery Your ninth cranial nerve (the glossopharyngeal nerve) is responsible for taste in the posterior third of your tongue. It is also responsible for innervating parts of the back of your throat. After surgery, this nerve may be disrupted somewhat, and this can cause problems with taste.please consult your Ent surgeon he will examine and treat you accordingly. I think I answered to your question if you have any questions please feel free to ask. take care