What are allergies?
Having an allergy means having a bad reaction to something in the air or something you eat or come into contact with.
These triggers are called allergens, and include pollen, mould and dust in the air, as well as foods such as nuts.
Allergies are common, according to Allergy UK, one in four people in the UK suffers from an allergy at some point in their lives.
No one knows why some people develop allergies, but they may be inherited. Allergies may flare up and subside throughout your life.