Examination method: mainly observe the patient's facial expression. When a person faints, call and push him. If there is no response, it means that he has lost consciousness and is seriously ill.
When people are sick, their expressions are cold, they don't want to talk, their words are low, their answers are slow, they are incoherent, their limbs are weak and they don't want to move.
Critically ill patients have pale face, soft muscles, unconsciousness, and no response to external activities such as inquiry and shoving.