Cats with leukemia may exhibit symptoms such as loss of appetite, weight loss, lethargy, swollen lymph nodes, anemia, infections, easy bruising, or bleeding. These symptoms can vary greatly in severity and may not all be present in every cat with leukemia.
Leukemia symptoms vary, depending on the type of leukemia. Common leukemia signs and symptoms include: Fever or chills. Persistent fatigue, weakness.

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Leukemia symptoms commonly include fatigue, breathlessness, infections, and bruising or bleeding more easily. Leukemia* symptoms vary depending on the type of leukemia. Not everyone gets the same symptoms, and you won't necessarily have all of the symptoms.
Open mouth breathing or panting, breathing rapidly, or any of these other signs show your cat is breathing heavily and might be in distress. There are many different causes of heavy breathing in cats. According to the Cornell Feline Health Center, the three most common are