Amyloidosis occurs when amyloid proteins are deposited outside cells in various tissues and organs causing tissue and organ dysfunction. It is uncommon in cats, except for Abyssinians, Siamese, Burmese, Tonkinese, Devon Rex, and Oriental shorthair breeds. Signs depend on the organs involved, but kidney involvement is most common. If kidneys are involved, signs include mouth ulcers, weight loss, vomiting, and dehydration. For cats with liver involvement, signs include weakness, pale gum color, distended abdomen, rapid heart rate, rapid breathing, abdominal pain, and collapse.

An abscess is a pocket of pus located somewhere in the body. Abscesses can be located superficially or deep within the body tissues. Typically, an abscess appears suddenly as a painful swelling (if it is not located inside a body cavity or deep within tissue). A cat with an abscess will often have a fever, even if the abscess has ruptured and drained to the outside of the body. One of the most common causes is a bite from another animal, but internal abscesses have other risk factors. Treatment involves removing the pocket of pus by drainage or surgery, as well as antibiotic therapy. Delayed or inadequate treatment may lead to chronically draining tracts in the tissue or even to organ system compromise, so it is important to follow all treatment instructions from your veterinarian.