Cats can suffer from various diseases that affect their health and well-being. Common illnesses include feline leukemia virus (FeLV), which weakens the immune system, and feline immunodeficiency virus (FIV), which can lead to serious infections. Other diseases include chronic kidney disease, which is common in older cats, and diabetes mellitus, which can affect their energy levels and appetite. Preventive care is essential for keeping cats healthy. Regular veterinary check-ups can help detect diseases early, while vaccinations protect against illnesses like feline panleukopenia and rabies. Maintaining a balanced diet and providing a safe environment also contribute to a cat's overall health.