A cat that keeps sticking out its tongue and dies may be caused by heatstroke, heart disease, or other diseases. The cause of death needs to be determined based on the cat’s actual condition. Generally, cats with heart disease may stick out their tongue and have difficulty breathing after exercise, and may even die suddenly if severe. Therefore, if you find that your cat frequently suffers from this condition, you should immediately send it to a pet hospital for examination and treatment to avoid life-threatening injuries. Danger.