Common health issues that affect cats include fleas and ticks, respiratory infections, urinary tract infections, dental diseases, and obesity. To prevent these health issues, it's important to provide cats with regular veterinary care, a healthy diet, and plenty of exercise. It's also important to keep cats indoors to prevent them from coming into contact with infectious diseases or being injured. If a cat does become ill, it's important to seek veterinary care right away. Treatment will depend on the specific health issue, but may include antibiotics, dietary changes, or other medications.