Nosebleeds do not occur spontaneously in cats. However, the nasal cavity is extremely sensitive
and bleeds easily when traumatized. Most nosebleeds are associated with a blow
to the face that damages the nose. Others are due to an erosion of the nasal
membrane caused by a foreign body, infection, tumor, or parasite. Rarely, a nosebleed may be a
manifestation of a generalized clotting disorder such as that produced by a low
platelet count, liver disease, or exposure to rodenticide anticoagulants.
When a cat’s nose bleeds as a result of trauma, a midline fracture to the
roof of the mouth may also have been incurred. Suspect this if the cat exhibits
open-mouth breathing. This fracture can cause misalignment of the teeth, in
which case the alignment must be adjusted and the teeth wired together to
stabilize the upper jaw until it is healed. Any cat who has a nosebleed after
trauma to the nose should be seen by a veterinarian.
As they age, cats often suffer a decline in functioning, including their cognitive functioning. It’s estimated that cognitive decline-referred to as feline cognitive dysfunction, or FCD-affects more than 55% of cats aged 11 to 15 years and more than 80% of cats aged 16 to 20 years. Memory, ability to learn, awareness, and sight and hearing perception can all deteriorate in cats affected with FCD. This deterioration can cause disturbances in sleeping patterns, disorientation or reduced activity...
Treatment: Nosebleeds may be accompanied by sneezing spasms that aggravate the bleeding. Keep the
cat quiet and confined. Apply ice cubes or cold packs to the bridge of the nose
to reduce blood flow and aid clotting. Slight bleeding usually subsides
quickly, especially if the cat is kept quiet. Persistent bleeding is a cause
for concern. Call your veterinarian.
WebMD Veterinary Reference from "Cat Owner's Home Veterinary Handbook"