How long does it take to go away after a seafood allergy varies from person to person and from condition to condition, and cannot be generalized. Seafood is an omnivorous protein, and some people may experience allergic symptoms after eating it, such as itching of the skin all over the body, accompanied by erythema and changes in the wind mass. If the symptoms are mild, after immediately stopping the consumption of seafood, while drinking more water to promote excretion, the symptoms can usually subside within a few hours to two days. However, some patients may still have symptoms after stopping seafood intake and may also have a rash that manifests itself as a rash, erythema, papules, etc. They need to be treated with medication at the Department of Allergy, usually with antihistamines taken orally. If the symptoms are still uncontrollable and shock manifestations such as panic, chest tightness and difficulty in breathing occur, first aid measures should be taken. During the period of seafood allergy, patients are advised to eat a light diet, try to eat easily digestible food to reduce the burden on the gastrointestinal tract, and avoid eating greasy, spicy and stimulating food.