My cat poops outside of his litter box.?

My cat started pooping outside of his litter box about a year ago. We tried switching his litter, getting him a second box, moving the location of the boxes, and nothing has worked. He started pooping right next to his litter box which was easy to pick up and bearable, however now hes been pooping behind our... show more My cat started pooping outside of his litter box about a year ago. We tried switching his litter, getting him a second box, moving the location of the boxes, and nothing has worked. He started pooping right next to his litter box which was easy to pick up and bearable, however now hes been pooping behind our couches, behind our television set, and elsewhere on our carpet. We don t know what to do. Can anybody offer advice?
Update: We've taken him to the vet. No medical issues.
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