An allergic reaction occurs when a person’s immune system becomes hypersensitive to certain substances, such as foods, pollen, medications, or bee venom. The first time a person is exposed to an allergen, they do not usually experience a reaction. It often takes time for the immune system to build up a sensitivity to the substance.

Some allergies are seasonal. For example, hay fever symptoms can peak between April and May, when the tree and grass pollen count in the air is higher. An allergic reaction causes inflammation and irritation. However, the specific symptoms will depend on the type of allergen.

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