The most common health problems cats experience include dental disease, upper respiratory infections, fleas and worms, obesity, and urinary tract infections. Dental disease is a common problem in cats, and can cause pain and discomfort. Upper respiratory infections are caused by viruses and bacteria, and can cause sneezing, coughing, and fever. Fleas and worms can cause itching, hair loss, and anemia. Obesity can lead to diabetes and other health issues. Finally, urinary tract infections can cause pain and difficulty urinating.