Cat ringworm is caused by fungal, bacterial infection, improper care, or infection from other cats with diseases. If a cat is found to have ringworm, isolate the cat as soon as possible, and then take the cat to a pet hospital for examination and treatment. During this period, the home environment should be thoroughly cleaned and disinfected to prevent bacterial residues, the cat's diet should be adjusted, and some nutritious food should be fed to the cat to enhance the body's immunity.