A health certificate is a health examination certificate, which proves that the holder has had a health examination in a certain year and month. It mainly involves six diseases in five industries, which greatly protects the health of employees and customers. The diseases mainly involved in health examination include viral hepatitis, dysentery, typhoid fever, active tuberculosis, skin diseases and other diseases that endanger health. If you find these diseases, don't engage in direct contact with imported food, hairdressing and beauty salons, public bathrooms and other work that directly serves customers. You can only work after you are cured.