Allergic reactions occur when the immune system overreacts to a harmless substance, called an allergen. The immune system is made up of special cells, called white blood cells, which fight infection. When an allergen is present in the body, white blood cells recognize the allergen, and release chemicals into the blood stream. These chemicals can cause inflammation of the skin, nose, throat, lungs or intestines.

Substances that trigger allergic reactions:

• Blood transfusion allergic reaction
• Dust mites
• Dyes used for imaging tests
• Exercise
• Exposure to cold
• Exposure to heat
• Insect bites and stings
• Latex gloves allergy
• Mold
• Pet dander
• Pollens
• Soaps, lotions, and detergents
• Sunlight
• Vaccines
• Vitamins
• Food additives:
• Sulfite allergy
• Tyramine allergy
• Tartrazine allergy
• Monosodium glutamate allergy
• Food allergies:
• Egg allergy
• Fruits
• Nuts
• Shellfish allergy
• Medication allergies:
• Antibiotic allergies
• Anti-inflammatory medication
• Aspirin