Updated 11/1/25 A uniquely feline health condition, hyperthyroidism, has risen to epidemic proportions since the first cases were diagnosed in 1979. It is a worldwide phenomenon, though it's worse in the U.S. than other countries. Hyperthyroidism (hyper = too much, thyroid = a hormone-making gland), is seen mostly in older cats. [Watch Floppy Cat's interview ... The post Hyperthyroidism in Cats appeared first on Little Big Cat - Dr. Jean Hofve.