The four diagnostic methods in TCM refer to the "four diagnostic methods" put forward by Bian Que on the basis of summing up the previous experience, that is, looking, smelling, asking and feeling. These four diagnostic methods are still widely used today, which are the important basis of TCM syndrome differentiation and treatment, referring to pulse diagnosis and pulse diagnosis.
Visiting is to observe the signs and phenomena of patients through doctors' eyes, and inquiring is to collect some useful knowledge through communication with patients.