. A health certificate is a document to prove a person's physical health, which is usually used to engage in a specific industry or occupation, such as food service and medical care. The main purpose of obtaining a health certificate is to ensure that employees will not spread diseases or endanger the health of others during their work. Menstruation is a part of women's physiological cycle and a normal physiological phenomenon, which will not affect their health. You can apply for a health certificate during menstruation, as long as your physical condition meets the relevant health requirements. When you apply for a health certificate, you need to carry out some physical examinations or inspections to ensure that your body meets the relevant health standards. These tests usually include physical examination, blood test, etc. The purpose is to assess the overall health status.