People with weak constitution, hypertension, diabetes, hepatitis, nephritis and other chronic diseases should choose raw sun ginseng. Raw sun ginseng is slightly cool, sweet taste, and has the effect of nourishing qi and nourishing Yin and producing jin. Red ginseng should be selected for deficiency and cold syndrome, lack of Yang qi, cold fear in winter, cold limbs, premature aging of the elderly and endocrine disorders of women. Red ginseng is warm, sweet and fragrant. Wild ginseng should be used in patients with severe cardiovascular disease, extreme postoperative weakness and dying. Wild ginseng is rare in production and expensive in price, but its effect is particularly strong, and it has the functions of strengthening the heart and calming the mind. American ginseng should be selected for lung deficiency cough, internal fire deficiency rise and initial recovery of pulmonary tuberculosis. American ginseng is cool and sweet. It has the functions of nourishing Yin and clearing fire, producing body fluid and nourishing lungs and kidneys.