A cat whose ears are not dirty but scratches and shakes its head may be caused by mosquito bites, water in the ears, cat moss, ear mites, etc. Because fungi and ear mites are very difficult to detect at first, so even if the ears are clean Skin infections are also possible. If your cat often suffers from this condition, you can use ear cleaning solution to wash the cat's ears to see if it gets better. If not, you need to send it to the hospital for examination.