It is well known that seafood is delicious and enjoyable to eat, but many people also know that eating seafood is easy to cause allergies, such as red spots on the skin after eating seafood, so eating seafood allergies is what we are afraid to see. So why are you allergic to seafood? Have you ever learned about it? What should we pay attention to when enjoying delicious seafood in the future to prevent eating seafood allergies?

Seafood is delicious and allergies are hard to prevent. Why are some people allergic to seafood?

1, histamine

(1) Seafood contains a certain amount of histamine, which is an active amine compound.

(2) As a chemical conductive substance in the body, it can affect many cell reactions, including allergies, inflammatory reactions, gastric acid secretion, etc., and it can also affect nerve conduction in the brain, causing people to want to sleep.

(3) Histamine exists in mast cells and also in the mucosa of lung, liver and stomach.

(4) Histamine plays a very important role in the regulation of allergy and inflammation. It belongs to a chemical message, and participates in sleep, hormone secretion, body temperature regulation, appetite and memory formation, and can also cause itching, sneezing, runny nose and other phenomena.

(5) Histamine binds to the receptor of vascular smooth muscle, which leads to vasodilation and local edema. Histamine can make the tracheal smooth muscle of the lung contract, which leads to respiratory tract stenosis and dyspnea, and intestinal smooth muscle contraction reduces blood pressure and increases heartbeat.

2. Causes of seafood allergy

(1) Once histamine in seafood is absorbed into the immune system, it will cause allergic phenomena.

(2) Most human bodies contain enzymes that decompose histamine, so allergic phenomena will not occur, but it is worth noting that if the intake of histamine exceeds the tolerance range of human bodies, allergic poisoning may occur.

(3) However, the so-called allergic poisoning and allergy are not the same. People who are allergic to seafood will have symptoms as long as they consume a small amount of histamine; Allergic poisoning is caused by excessive intake of histamine, so even normal people with histamine-decomposing enzymes in their bodies may still have allergic poisoning.

(4) Because the symptoms of allergic food poisoning are almost the same as those of allergies, misdiagnosis often occurs when seeking medical treatment. Therefore, patients should tell their doctors in detail what they have eaten and how much, so as to make a correct diagnosis.

3, seafood allergy symptoms

(1) The onset of seafood allergy poisoning is usually 0.5~ 1 hour after eating, sometimes as long as 5 minutes, or as long as 4 hours.

(2) Mild symptoms at onset, quick recovery and occasional death.

(3) Often manifested as blushing, dizziness, headache, heartbeat, palpitation, chest tightness, shortness of breath, swelling of face and lips, numbness of mouth and limbs, nausea, vomiting, itchy skin, etc.