Hairy substances is a term used in Chinese medicine to refer to foods that tend to induce certain diseases, aggravate the severity of diseases, delay recovery from diseases or affect the recovery of local wounds. From the perspective of modern medicine, the so-called hairy foods may be related to certain hormones, heterogeneous proteins or irritating ingredients contained in the food. Usually, hairy foods can be divided into several categories such as seafood, vegetables, fruits and meat: 1. Seafood: mainly sea shrimp, yellow fish, crabs, etc. These foods usually contain more proteins, which may induce immune system activation for people with hyperimmune function, leading to the occurrence or aggravation of some immune system diseases such as urticaria; 2. Vegetables: some more stimulating vegetables, Mushrooms, such as leeks, shiitake mushrooms, ginger, garlic, etc. also belong to hairy substances, excessive consumption may easily lead to abdominal distension, diarrhea and other symptoms of indigestion; 3, fruits: fruits that are generally too high in sugar content are considered hairy substances, such as durian, honeydew melon, prunes, etc.. These fruits are also considered hairy due to the high rate of sugar, and high blood sugar will affect the speed of wound healing and easily induce infection; 4, meat: some meat with high protein content and easy to trigger allergic reactions are also considered hairy, such as beef, mutton, goose, etc.. In addition, spicy and irritating foods such as boiled fish and spicy hot pot, as well as wine or foods containing alcohol, such as wine dregs and wine brew, are also often considered to be hairy substances. They should be avoided in case of weakness, illness or hyperactive immune system.