Ask a Vet and Get Your Veterinary Questions Answered.
1. Is your cat taking any thyroid medications now? Even after the radioactive iodine they sometimes continue to need medication. Some cats will even go the other direction and get HYPOthryroidism after the iodine treatment.
2. Are you 100% sure she doesn't have fleas?? Do you put flea prevention medication on her? Cats that are indoor only can still get fleas especially if you have other pets that go outside. Scabs all over the body in a cat is almost always flea related. Cats are fastidious groomers so you may not see the fleas on her but you should be able to see flea dirt.
3. What kind of food is she eating?
4. How old is she?