Id card and social security card must be brought. There is also a medical card, which is used to see a doctor in this hospital. Now I also have a Beijing medical card. If you have done it before, you should go to the hospital to apply for this card in advance and then register. Or call 144 or make an appointment online, and bring the above three certificates in advance. There is also a blueprint for seeing a doctor, which is a notebook for doctors to record their illness. If you don't eat, you will be asked to buy one, otherwise the doctor will not be able to record it.