Shellfish Allergy



Shell allergy is an abnormal reaction by the body’s immune system to certain marine animal proteins. Shellfish include marine animals containing shells of shrimp, crab, oyster, lobster, octopus, squid, scallops etc.

People who are allergic to shellfish react to all crustaceans.Other people react only to certain kinds. Reactions are severe due to mild symptoms such as urticaria and runny nose, and even life threatening things.

If you think you are allergic to crustacea, consult your doctor.Since the test helps to confirm the allergy of crustaceans, measures can be taken to avoid future reactions.


Symptoms of shellfish allergy usually develop within minutes to an hour to eat shellfish. They may include the following:

  • Urticaria, itching or eczema (atopic dermatitis)
  • Swelling of the lips, face, tongue, throat, or other parts of the body
  • Wheezing, stuffy nose, breathing disorder
  • Abdominal pain, diarrhea, nausea or vomiting
  • Dizziness, lightness or syncope
  • Achive in the mouth

Allergies can cause serious and potentially life-threatening reactions known as anaphylaxis. Anaphylactic reactions to shellfish or something are medical emergencies that require treatment with epinephrine (adrenaline) injection and travel to the emergency room.

Signs and symptoms of anaphylaxis include the following:

  • Breathing becomes difficult due to a swollen throat or
  • throat mass (airway narrowing)
  • Shock, a serious drop in your blood pressure
  • Rapid pulse
  • Dizziness, dizziness, loss of consciousness

When going to see a doctor

If you have symptoms of food allergy immediately after a meal, please consult your doctor or an allergist. If symptoms or symptoms of anaphylaxis appear, please receive emergency treatment.


All food allergies are caused by immune system overreaction.Your immune system identifies certain shellfish proteins as harmful and triggers the production of antibodies against shell proteins (allergens). Next, when in contact with allergen, the immune system releases histamine and other chemicals causing allergic symptoms.

Types of shells

There are several kinds of shellfish, each containing different proteins.


include crabs, lobsters, crayfish, shrimps, and shrimp.


include squid, snail, octopus, rope, oyster, scallops.
Some people are allergic to the only type of shellfish, but other people can eat. Others who are allergic to shellfish must avoid all shellfish.

Risk Factors

If any type of allergy is common to your family, the risk of developing crustaceans allergies will be higher.

People of all ages may develop allergy to shellfish, but in adults it is more common. Among adults, shellfish allergy is more common in women. Among children, shellfied allergy is more common in boys.


In severe cases, crustacean allergy can cause dangerous allergic reactions characterized by anaphylaxis, swelling of the throat (airway narrowing), rapid pulse, shock, and dizziness or dizziness. Anaphylaxis can be life-threatening.

If you are allergic to crustaceans, the risk of anaphylaxis may increase in the following cases:

  • You have asthma
  • You have an allergic reaction in a very small amount of
  • shellfish (extreme sensitivity)


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