Allergen Information Center

One of the most common food allergens that can cause severe reactions such as anaphylaxis.

Allergy to tree nuts like walnuts and almonds can be severe, causing hives, swelling, and even anaphylaxis.

A major food allergen that can cause symptoms like hives, respiratory issues, and is a leading cause of anaphylaxis.

Egg allergy can cause hives, digestive issues, and, in rare cases, anaphylaxis.

Can cause reactions like hives and respiratory symptoms; anaphylaxis is rare but possible.

Often causes mild to moderate symptoms such as skin irritation or digestive problems, but severe reactions can also occur.

Sesame allergy can be severe, leading to multi-system reactions like anaphylaxis.

Fish allergy (e.g., cod or salmon) is more common in adults and can range from mild hives to severe anaphylaxis.

Shellfish allergies, including shrimp and crab, are common and potentially dangerous, leading to hives, itching, and anaphylaxis.

Causes hay fever (runny nose, sneezing, itchy eyes) and sometimes allergic asthma. Severe reactions are rare.

Triggers airway inflammation, sneezing, and runny nose; can cause or worsen asthma.

Mold spores in the air can cause nasal congestion, sneezing, coughing, and itchy eyes, sometimes triggering asthma attacks.

Causes allergic rhinitis symptoms such as sneezing, runny nose, and itchy eyes. In some cases, it can trigger allergic asthma.

Proteins in cockroach droppings and bodies can trigger sneezing, coughing, and asthma attacks.

Bee venom can cause rapid and severe reactions; in allergic individuals, it may lead to anaphylaxis, which is life-threatening.

Fire ant stings cause painful, burning sensations, followed by red bumps and pus-filled blisters. Severe allergic reactions, including anaphylaxis, may occur in sensitive individuals.

Wasp stings can be extremely painful and lead to swelling, redness, and allergic reactions. In some cases, severe anaphylaxis may develop, requiring immediate medical attention.

The most common drug allergy; reactions range from rashes and hives to life-threatening anaphylaxis.

Can cause hives, runny nose, and asthma attacks; anaphylactic reactions have also been reported in some cases.

Proteins in natural latex (found in gloves, balloons, etc.) can trigger hives, itching, and sometimes anaphylaxis.

Skin contact with nickel (e.g., in jewelry) usually causes contact dermatitis – itchy rashes at the point of contact.

The urushiol oil in poison ivy leaves causes severe contact dermatitis, with red, itchy rashes and blisters appearing 1–2 days after contact.