Yin and Yang deficiency have symptoms such as pale or dark face, fear of cold, pale mouth without thirst, loss of appetite, cold hands and feet, diarrhea, edema, pale and fat tongue, white slippery moss, and dull and weak pulse. Because of the yin and cold inside and lead to the weakness of yang qi, yang qi weakness and can not restrain the yin and cold qi, further aggravate the body cold. Clinically, yin and yang deficiency is mostly caused by water-dampness injury to yang, overdose of cold medicines, or yang deficiency in the body. Yin and cold are prevalent within the body, so there will be symptoms such as fear of cold, cold hands and feet. Yang is weak and the blood is not warmed, so there will be symptoms of pale or dull complexion; spleen yang deficiency, transport and transformation failure, water-dampness flooding, there will be symptoms of diarrhea, edema, tastelessness of the mouth, loss of appetite. People with yin and yang deficiency may also see a pale and fat tongue with white slippery moss and a dull and weak pulse. If any of these symptoms occur, it is recommended to go to the hospital in time for formal treatment under the guidance of a Chinese medicine practitioner.