Humans cannot resist the temptation of food. However, some foods can cause allergic reactions in the human body, such as seafood, and if an allergic reaction occurs while eating seafood, these symptoms can range from mild to severe and can be life-threatening. Signs of an allergic reaction to seafood include: skin reactions such as hives, itching, or pale skin; wheezing or difficulty breathing; dizziness, lightheadedness, or fainting; facial swelling; nausea; and weak, rapid pulses. Allergic reactions are generally acute and slow. If there is a delay of a period of time after eating seafood, the occurrence of allergy people. In the diet must be careful not to eat seafood food. Because once the patient eats seafood, an allergic reaction will occur, do not have a chance. When the patient has an allergic reaction, if it is only itchy skin, red rash, you can use some drugs such as loratadine for treatment, most of the results are better. If the patient has an acute allergic reaction and it is more serious, with symptoms such as difficulty breathing, chest tightness, nausea and vomiting, etc., the patient should remain calm and make sure his or her clothing is loose. One should remain calm, make sure the clothes are loose, and should keep the head tilted to one side to avoid choking symptoms. It is important to go to a regular hospital immediately for resuscitation and timely use of fast-acting and potent drugs. When the patient has these symptoms, attention must be drawn to the fact that these phenomena have indicated an allergic reaction in the organism.