<s>[INST] Hi there. For a while now I ve been having a strange sensation on my tongue? It feels quite heavy along one side and I have to scrape my tongue against my teeth to get rid of the sensation? I have had my fiancée check it and she says there doesn t seem to be any lumps or bumps or marks of any kind? I take codeine phosphate for a bad back but this has been going on before taking the medication. Any ideas? [/INST] THERE ARE MANY REASONS FOR THAT...BUT MOST COMMONEST BEING BALD TONGUE THAT HAPPENS OWING TO THE LOSS OF TONGUE PAPILLA...THIS HAPPENS IN VITAMIN DEFICIENCY OR IRON DEFICIENCY. CONSULT UR DENTAL SURGEON AS IT REQUIRES CLINICAL EVALUATION </s>