Cases of heartworm disease in cats have been reported across the United States and many other countries, too. Heartworm disease is most common in areas where dogs are also at risk. In fact, most common clinical signs of heartworm disease in cats resembles bronchial asthma. Treatment is very risky, because there's currently no approved product for treating adult cat heartworms, and the onset of clinical signs is impossible to predict in cats that are left untreated. Even if the disease is treated, your cat may experience severe complications or even death when the worms die.
Prevention is the best medicine.
Ask your veterinarian about heartworm disease prevention for your cat.