Want a health certificate. A health certificate is a health examination certificate, which proves that the holder had a health examination on. It mainly involves six diseases in five industries, which largely guarantees 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.