Malnutrition can be manifested as obvious wasting, muscle atrophy and gastrointestinal discomfort. 1. Obvious wasting: the presence or absence of obvious wasting can be reflected by the change of body weight, which can be used as the standard of nutritional evaluation. Obvious wasting refers to the case of no subjective awareness of weight control, weight loss of more than 10% or weight loss of more than 5% within 3 months, suggesting that there is obvious wasting that is malnutrition. 2. Muscle atrophy: the evaluation of muscle function can be reflected by the determination of grip strength, which can reflect the correlation between muscle strength and nutritional status of the body, and can be repeatedly measured and followed up throughout the course of the disease. Normal male grip strength is greater than or equal to 35kg, female grip strength is greater than or equal to 23kg, if less than this standard, it suggests the existence of muscle atrophy, i.e. malnutrition. 3. Gastrointestinal discomforts: some of them may be manifested as partiality, anorexia, loss of appetite, or even nausea, vomiting, diarrhea and other discomforts. If malnutrition is present, it is recommended to go to a regular hospital to actively find the cause of the disease and receive relevant treatment to avoid delaying the disease.