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"Hay fever. A child's eyes, swollen with fluid (orbital oedema) as a result of hay fever. Hay fever is a very common allergic response to air- borne particles, or \allergens\"", such as pollen. When allergens are inhaled, or when they come into contact with the eyes, they provoke an exaggerated response from the immune system. Typical symptoms include a runny nose and watering eyes. Pollen-induced hay fever is seasonal, occurring especially in summer when grass pollen is abundant. This patient also suffers from allergic conjunctivitis, where the eyes become red, watery and sore.""" (KEYSTONE/SCIENCE PHOTO LIBRARY/SCIENCE PHOTO LIBRARY)