In clinical practice, Yang deficiency and Yin deficiency can be identified by their own symptoms. The main symptom of yang deficiency is usually the fear of cold, which can be manifested as cold hands and feet, cold stomach, back, waist and knee. Drinking or eating cold food can lead to related discomfort symptoms of the body. It is easy to have diarrhea symptoms after getting cold. It is more intolerant of cold than ordinary people, and has poor physique. It is easier to catch a cold than others. The main symptom of yin deficiency is fear of heat, which can be manifested as fever on hands, feet, body and face, dry skin and lips, and reddish lips compared with normal people. Hot flushes or redness on the cheeks are more likely to lead to constipation or dryness of stool, dry eyes, dry mouth and dry throat, and always want to drink water. It can also be accompanied by insomnia, night sweats and other symptoms.
