An allergy is a hypersensitivity reaction of your immune system to actually harmless substances. Whether pollen, animal hair or certain foods – your body incorrectly classifies them as dangerous and increases its defenses.
Typical signs? Redness of the skin, swelling, itchy eyes, runny nose or cough. In severe cases, it can even cause asthma attacks or allergic shock. The triggers for these reactions are called allergens – and they can be lurking anywhere.
