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Hives, Itching or Eczema
These are skin reactions often caused by shellfish allergy. The person may develop hives (blush-colored, often itchy bumps) on the skin, uncontrolled itching or even eczema (an inflamed, itchy skin condition).
Swelling of the face, lips, tongue and throat, or other parts of the body
Edema, or Swelling is another common symptom. Shellfish allergens can cause the body to produce histamine, which can lead to swelling in various parts of the body, including the face, lips, tongue, throat and other body areas.
Wheezing, Nasal Congestion or Difficulty Breathing
Respiratory symptoms can also occur with shellfish allergies. The person may start wheezing, have difficulty breathing, suffer from nasal congestion, or even cough.
Abdominal Pain, Diarrhoea, Nausea or Vomiting
Shellfish allergies can cause gastrointestinal symptoms including stomach pain, diarrhoea, nausea and vomiting. Individuals with a severe allergy may even have immediate vomiting after ingesting shellfish.
Dizziness, Fainting or Lightheadedness
For some individuals with a shellfish allergy, dizziness, light-headedness, and fainting can occur. This may be due to a drop in blood pressure as the body overreacts to the shellfish allergens.
Anaphylaxis
In severe cases, people with shellfish allergy may experience anaphylaxis, a life-threatening allergic reaction that requires immediate medical attention. Symptoms can include a rapid, weak pulse, nausea, and a skin rash. It can cause difficulty breathing, fainting, and can put the person into shock.
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