Hay fever is the most common form of allergy.
Its medical name is allergic rhinitis. It causes nasal irritation, sneezing and watery eyes together with a blocked and runny nose. One of the common causes of hay fever is pollen from different plants which means that hay fever can cause symptoms at different times of the year Some people suffer from allergic rhinitis all year round. This is often due to an allergy to dust mites or fungus. Hay fever usually begins in childhood and many people outgrow it when they reach the age of 30 or 40.