What is the meaning of "looking, smelling, asking and feeling" in traditional Chinese medicine?

In the four diagnoses of traditional Chinese medicine, "looking" refers to looking at the patient's complexion, expression, body shape, excrement and so on. "Smell" refers to listening to the patient's voice and smell, and "ask" refers to understanding the course of disease, medication, family history and so on. In conversation with patients, "pulse diagnosis" refers to feeling the pulse, touching the skin, joints, bones and so on. , also called palpation.

Through the above four diagnoses, the detailed data of patients are collected, the diseases are extracted and comprehensively judged, and the etiology, pathogenesis, pathogenesis, present stage and prognosis of the diseases are analyzed. Finally, make a treatment plan.