Allergic symptoms occurring in the diet do not appear immediately, but usually only after the second or third exposure. After the first dietary food enters the body if an allergic reaction occurs with the body, it will cause the mast cells in the body to be in a pre-allergic state and in a markedly mild edema. After the second or even third exposure, the concentration of allergens will reach a certain level, leading to the degranulation of mast cells and the release of various active substances, resulting in significant allergic symptoms, which may lead to significant wind-like changes all over the body, accompanied by significant itching, and in some cases, changes such as vesicles, oozing and crusting, as well as clinical symptoms such as erythema and papules. Once this food allergy appears, it can be treated with desensitizing drugs such as oral loratadine tablets or cetirizine tablets.