I'm assuming your cat is an older one from how you worded things.
It's far more common for an older cat to have a HIGH thyroid not a low one. Unless there were other indicators for a low thyroid doing a test would have just wasted your money.
If your cat is having a difficult time getting around it could be arthritis. Ask your vet about a glucosamine supplement. Dusty used to take Cosaquin for cats for years, it did help. If your cat is having a difficult time jumping or getting around it would cause them to burn less calories and would result in a weight gain which is harder on aging joints a vicious circle. Ask about the glucosamine at your vets, and also if your cat is over 7-10 years old make sure you are feeding a senior cat food, they have less calories, unless your cat is already on a special or prescription diet.
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