1. You can know your physical condition, especially infectious diseases.
2. Some special jobs require higher health.
3. Some employees need to travel or go abroad to work in other units because of the company's needs, and the other party requires to show their health certificates.
Legal basis:
Measures of Nanjing Municipality on the Administration of Employees' Health Certificates (for Trial Implementation)
Article 2 The handling of employees' health certificates as mentioned in these Measures refers to the activity that the employing unit conducts health examination for employees who have reached the age of 16 in accordance with the provisions of these Measures, and issues preventive health examination certificates (hereinafter referred to as health certificates) for employees in Nanjing.
Article 11 Following the principle of "whoever has a physical examination shall issue the certificate and whoever has a physical examination shall be responsible", institutions and personnel engaged in preventive health examination shall standardize sample collection and ensure the quality of physical examination. If it is found that the inspected cannot rule out related diseases, a health certificate shall not be issued.