Hay Fever Eye Drops

An allergy is a result of coming into contact with a substance that the body thinks is a threat. This causes the body to release histamine, which helps to fight the substance. Histamine is responsible for many of the symptoms that are associated with an allergy such as hay fever.

Hay fever, or any allergy, will last for as long as you come into contact with the allergen, the substance that causes the allergy. This can last for up to a few weeks.