It may be that the cat’s nose has been injured by external force. For example, the cat accidentally injured it in a fight, or the nose touched a hard object, etc., which will injure its fragile nasal cavity. It is also possible that there is a foreign body in the cat's nasal cavity. The foreign body can damage the blood vessels of the nasal mucosa. When the blood vessels are damaged, blood will flow out of the blood vessels.

Infections in the nasal cavity of cats include upper respiratory tract infections, spotted fever, and ehrlichiosis. In addition, feline immunodeficiency virus, feline leukemia virus infection, and certain fungal infections have also been shown to cause nasal bleeding in cats.

Rat poison poisoning is a common cause of nosebleeds in cats. In addition, cats may smell other potential substances that can irritate sensitive nasal mucosa, causing trauma and bleeding in their nasal passages.

Frequent nosebleeds are usually related to flea and tick infestations in cats. These parasites will reduce the coagulation ability of the cat's blood. When the blood coagulation ability is reduced, it will cause the cat to bleed uncontrollably. In severe cases, May endanger your cat's life.

Cat nosebleeds may have other causes, such as liver or kidney disease, or even uncontrolled high blood pressure. Nasal ulcers and certain drugs (estrogens, methimazole, sulfonamide antibiotics, and chemotherapy drugs) can also cause nosebleeds in cats.