Some people will have itching and erythema after eating crabs. In fact, this is an allergic reaction to eating crabs.

Causes of eating crab allergy

Crab is a cold allergic food. For allergic people, crab meat enters the human circulation through the intestinal wall, which will induce allergic reactions and cause gastrointestinal smooth muscle spasm, angioedema, rash, asthma and so on. In severe cases, it may even cause anaphylactic shock.

Because of individual differences, hereditary allergic constitution, the lack or reduction of certain enzymes in the body is the basis of allergy, and the body's sensitivity to food is different in some physiological or pathological States, which can also lead to allergies.

Some people had nothing to do with eating seafood, but after eating stale seafood, it will produce a lot of histamine-like substances, which will cause allergies and even food poisoning after being absorbed by the human body.

Some people feel sick after eating crabs. For example, they will feel that there are large red pimples on their skin, which is particularly itchy. Some people even have vomiting, headache, abdominal pain and other symptoms. If these symptoms appear, we must deal with them in time.

Second, what are the symptoms of eating crab allergies?

Many people have itchy symptoms after eating crabs. When they grab their hands, large red papules appear on their skin, which quickly spread to the whole body, and the itching is unbearable-this is an allergic reaction caused by eating crabs, acute urticaria.

Skin allergic reaction caused by eating seafood such as crabs is usually called "rash", which is characterized by itchy skin and red or reddish edematous erythema. Some people also have nausea, vomiting, headache, head swelling, abdominal pain, diarrhea and other adverse reactions.

Because there are many germs in the stomach of crabs, if they are not fresh and cooked, the germs will spread to the whole body through the intestines, and nausea, vomiting and diarrhea will occur, and in severe cases, vomiting and diarrhea will occur.

If the patient has symptoms such as vomiting and diarrhea, it will cause excessive water loss, acid-base imbalance or collapse, and even life-threatening. Once poisoning occurs, the patient must first spit out all the crab meat he has eaten. The best way is to induce vomiting. You can put your finger into your throat and press the root of your tongue to induce vomiting until you finish vomiting.

If it is serious, it will not be effective if you don't go to the hospital in time for first aid.

Pregnant women are in a special period. If they have the above symptoms after eating crabs, they should go to the hospital immediately.

Third, the solution and taboo of eating crab allergy

1. If the allergic symptoms are mild, you don't need to take any medicine or special treatment. 1-2 days later.

2. If the allergic symptoms are obvious and the whole body itches unbearable, you can try to take common anti-allergic drugs.

3. you can also take vitamin c while taking antiallergic drugs.

4. While taking the medicine, you can also apply dermatitis flat ointment to itchy skin with a red rash.

5. Such as dyspnea, cold hands and feet, palpitation, etc. You should go to the hospital at once, which means you have eaten crabs before.

6. Don't eat seafood such as crabs and shrimps during allergies, and don't eat greasy and spicy food.

Precautions for eating crabs

Avoid eating crabs raw: the body surface, gills and gastrointestinal tract of crabs are covered with all kinds of bacteria and sludge. Eat crabs through steaming and cooking. Generally, it can be disinfected by heating for more than 30 minutes after boiling.

Second, avoid eating dead crabs: buy dead crabs. Bacteria in the dead crab quickly proliferate and spread into the crab meat, decomposing amino acids in the crab meat and producing a large number of harmful substances. Eating dead crabs may cause vomiting, abdominal pain and diarrhea. In addition, dying crabs are not suitable for purchase.

Three do not eat crabs overnight: crabs are foods with more histamine acid. Histamine acid in crabs left over overnight will be decomposed into histamine by some microorganisms. Although heating in the pot can kill pathogenic microorganisms, it cannot destroy toxins and lead to histamine poisoning. So it is best to eat steamed crabs now, generally not more than 4 hours.

Fourth, don't eat too much: crab meat is cold and should not be eaten more. People with spleen and stomach deficiency and cold should pay special attention to avoid abdominal pain and diarrhea. You can usually eat one or two crabs, and it is best to drink a cup of ginger tea to drive away the cold after eating crabs.

Five avoid drinking tea water: avoid drinking tea water when eating crabs and within 1 hour after eating crabs. Because boiling water will dilute gastric acid, tea will solidify some components of crabs, which is not conducive to digestion and absorption.

Four, these five types of people can't eat crabs.

The first category: people with allergic history of eating crabs or urticaria, allergic asthma and allergic dermatitis, especially those with allergies such as children, the elderly and pregnant women, had better not eat crabs;

The second category: patients with cholecystitis, gallstones, hepatitis, acute and chronic pancreatitis and severe cardiovascular and cerebrovascular diseases should eat as little as possible or not eat crabs, and should not drink with crabs to avoid aggravating their illness or causing acute attacks of the above diseases;

The third category: people with diarrhea, stomachache, cold, fever or deficiency of spleen and stomach should not eat crabs, because crabs are cold foods with high protein and fat content, which are not suitable for digestion and absorption. At the same time, they will aggravate spleen and stomach discomfort and have symptoms such as abdominal pain, diarrhea and vomiting.

The fourth category: pregnant women with weak constitution are not suitable for eating crabs, otherwise it may lead to miscarriage;

Category 5: Infants should not eat crabs, because high protein will increase the burden on liver and kidney.

As for crabs, we all know that friends with allergic skin can't eat them according to our common sense of life, because crabs have a great influence on the condition of this disease. I hope that friends with allergic skin will avoid eating crabs when they are allergic. People with allergic skin are generally not allowed to eat some seafood, such as crabs, mussels and shells. I hope you can understand.