Cats do more than give you company -- they can also keep the doctor away. Cat parents tend to visit the doctor less frequently than non-owners. Whether it's the stronger immune system that develops from laughing at your kitty or a physiological increase in secretory immunoglobulin A -- part of your immune system -- that occurs when you pet your cat, you're likely to avoid common cold more often than non-owners. People with chronic diseases or painful conditions such as fibromyalgia often find purpose in their kitties: a reason to get out of bed and a motivation to be productive. Petting and playing with your cat can distract you from illness and pain when it occurs.