A. It's very possible that your cat has developed allergies to flea saliva. It's pretty common in cats that have been routinely infested with fleas. Unfortunately dealing with it at this point is not as simple as getting the fleas off (and making them stay away); you have to deal with the allergies themselves. That's likely what's behind the hair loss and the constant scratching.
Your vet can help to get rid of the fleas, and then use medications to treat the allergies. Other things that need to be ruled out are mites (mange) and ringworm, as well as food allergies, but I'd bet the fleas are the underlying problem.
DISCLAIMER: The answers in Ask petMD are meant to provide entertainment and education. They should not take the place of a vet visit. Please see our Terms and Conditions.
IMPORTANT: The opinions expressed in Ask petMD content area are solely those of the User, who may or may not have medical or scientific training.
Our Ask petMD experts include veterinarians, vet techs, veterinary students, pet trainers, pet behaviorists and pet nutritionists. These opinions do not represent the opinions of petMD.
User-generated content areas are not reviewed by a petMD veterinarian or any member of the petMD editorial staff for accuracy, balance, objectivity, timeliness, or any other reason except for compliance with our Terms and Conditions.
petMD does not endorse any specific product, service, or treatment. Do not consider petMD user-generated content as medical advice.
Never delay or disregard seeking professional medical advice from your veterinarian or other qualified healthcare provider because of something you have read on petMD.
Your account has been reactivated.