In traditional Chinese medicine, fingers are often used to press the radial artery (wrist inch) of patients, and the internal changes of patients' syndromes are understood according to the comprehensive signs composed of the position, frequency, intensity, rhythm and pulse waveform of patients' superficial arteries.

The above four methods of diagnosing diseases are not isolated from each other, but interrelated.

Traditional Chinese medicine has always emphasized "four diagnoses combined with reference", that is to say, it is necessary to comprehensively analyze the diseases collected by four clinics, remove the rough and extract the essence, and remove the false and retain the true, so as to make a comprehensive scientific judgment from the outside to the inside.