Can you throw up from allergies?

All allergies work the same way: Your immune system believes a harmless substance to be dangerous and releases antibodies, triggering a number of chemicals to fight off the offending allergen. This results in allergic symptoms. Throwing up, sneezing, cramps and difficulty breathing are all allergy symptoms.

Vomiting as an allergic reaction is less common than the others, though. It is a rare reaction to a pollen allergy. For some, an allergic reaction to a food may be severe and even life-threatening. Common food allergy signs and symptoms are mouth itch, hives, swelling of the lips, face, or tongue, wheezing and difficulty breathing, diarrhea, nausea or throwing up and anaphylaxis, undoubtedly the worst of them all.

Common allergens

Foods that commonly cause allergic reactions, including vomiting, include shellfish, peanuts, fish, tree nuts, eggs, cow’s milk, soy, wheat and the allergen pollen (to a lesser extent).

Proteins in certain fruits, nuts and vegetables cause the reaction because these and allergy-causing proteins in pollen are alike. This phenomenon is known as cross-reactivity. To avoid severe allergic reactions, cook the foods you are allergic to – thermal processing diminishes their allergenic potency.

Fun facts

  • If you are allergic to birch pollen, you could also be allergic to almonds, apples, carrots, apricots, cherries, peaches, pears, hazelnuts, peanuts, plums, soybean and raw potatoes.
  • If you are allergic to Mugwort pollen, you could also be allergic to apples, broccoli, bell pepper, cabbage, garlic, carrots, onion, celery, peaches, cauliflower, anise, fennel, black pepper, mustard, caraway seeds, parsley and coriander.
  • If you are allergic to ragweed pollen, you could also be allergic to bananas, melons, cucumber and zucchinis.
  • Finally, if you are allergic to grasses, you could also be allergic to oranges, tomatoes, peanuts, white potatoes and zucchinis.

Food intolerance

Food intolerance can also make you throw up, just like a food allergy depending on the type. It is possible to eat small amounts of problem foods without an adverse reaction if you are merely intolerant, but if you really are allergic, even a small quantity may trigger an undesirable reaction. In other cases, people are allergic, but not to what they think… for example not to fish, but to a substance used to cook it.