Many people have physical reactions to things called allergens.
Allergens are things such as pollen, feathers, dust, foods, animal fur and medicines.
Hay fever This is the most common allergy. Its symptoms are sneezing and a stuffy, runny nose. It is a reaction to pollen and is usually quite minor. If you find that the symptoms are becoming troublesome then see your doctor. He may prescribe medicines such as eye drops, nasal spray or inhaler to damp down your body's reaction to pollen.