Cats take Fall Damage

First of all, some people don't seem to realize that a cat can get hurt when it's thrown into the air. Although a cat can always safely land on their feet if they are given enough time and space this does not warrant you throwing your cat. And although they can minimize the impact, their paws still need to take the full brunt of their body weight.

Now please avoid throwing a cat just to see it twist in the air. If you throw it enough, eventually it'll mess up a landing and might even recieve internal injuries and broken bones. Even if your cat always lands on its paws, there is still a considerable risk of breaking multiple bones from the toes, feet, and ankles all the way up to the legs.

Even if your cat is hurt, its natural instinct would be to hide that fact in case any predators are nearby.

Cats are also really small compared to humans and thus it is even harder for a human to comprehend how heavy handed they might actually be.