If you’re worried that your cat has worms, you’ll have to do some detective work.  Some signs to look for is lethargy, vomiting,  blood in the stools, diarrhea and abdominal pain. There could also be a lack of appetite or weight loss.  Some of these parasites are visible to the naked eye.  Look closely under your cats tail as well as in her bedding, stools and vomit.  Your veterinarian could use a microscope to examine samples of smaller worms and eggs.  There are several types of worms that can invade and harm your pet. Some of them could actually be transmitted to humans.  It’s very important that you seek treatment from your veterinarian as soon as possible. There is pet medication that can help cure this problem.