Thin refers to lean muscles, underweight, and even skinny. There are records of "expelling wind", "breaking rouge" and "shedding flesh" in Neijing. In other medical books, there are names such as Tuoxing, Routuo, Routuo and Zhu Shou. Under normal physiological conditions, the body's fat and thin vary greatly. If the body is thin, but full of energy, the face is smooth, the tongue pulse is normal, and the body is not diseased, this is not the case. Therefore, the diagnosis of emaciation in traditional Chinese medicine needs syndrome differentiation and classification.

The diagnosis of emaciation in traditional Chinese medicine needs syndrome differentiation and classification;

1, qi deficiency and emaciation of spleen and stomach: emaciation, loss of appetite, abdominal distension after eating, loose stool, fatigue, qi deficiency and laziness, sallow complexion, pale tongue with white fur and weak pulse.

2. Weakness and emaciation of qi and blood: emaciation, sallow complexion, fatigue, shortness of breath, laziness, dizziness, palpitation and insomnia, pale tongue with thin coating and thready pulse.

3, lack of lung yin and emaciation: emaciation, dry cough with little phlegm, blood in sputum, or hemoptysis, dry mouth and throat, hot flashes and night sweats, red cheekbones in the afternoon, five upset and hot, red tongue with little body fluid, and rapid pulse.

4, stomach heat and emaciation: body emaciation, thirst and cold drinks, overeating and hungry, upset bad breath, short and red urine, dry stool, yellow and dry tongue coating, strong pulse.

5, excessive liver fire and emaciation: emaciation, irritability, dizziness, burning pain in the ribs, bitter mouth and red eyes, short and red urine, dry stool, red tongue with yellow fur, and rapid pulse.

6. Insect accumulation and emaciation: emaciation, sallow complexion, noisy epigastric pain, intermittent abdominal pain, loss of appetite, or eating foreign bodies, thin stool, pale tongue with white fur and weak pulse.