Arthritis, in particular, can affect older cats. Cats are great jumpers, and they make use of this ability many times during their daily activities. When a cat reaches his senior years, he will no longer be able to jump as easily. This is especially true of cats that develop arthritis. This condition is particularly common in cats that have had joint injuries in the past. Its effects range from slight stiffness to complete debilitation. If your cat seems to be suffering from arthritis, take him to the vet. Many cats are given glucosamine to relieve the pain and swelling caused by arthritis. Keep in mind that many cats have severe reactions to medications like aspirin, so as much as it hurts you to see your cat in pain, wait for a prescription from your veterinarian before giving any medication to your kitty.