Cats are easily attracted to anything moving and sometimes they come across an unfriendly bee or wasp and get stung. Like humans the cats are also allergic to this and may require immediate vet attention depending where it was stung.
They get stung on the throat or mouth when try to eat a bee and such sting can be threatening as it may cause suffocation. If you can spot the sting it should be removed as we do for ourselves. Scroll down the page to see how funny they look after getting stung. via boredpanda