An allergy is the strong, often 'exaggerated', way in which the body reacts to a substance, An allergic tendency develops when the body learns to fight a certain susbstance strongly and in the wrong way. In case of hay fever, for instance, the patient experiences a bodily reaction to the pollen grains of certain plants. When these pollen grains are inhaled int he spring season, the nose swells up, the eyes become watery, and excessive sneezing starts. Allergic reactions can be reduced and controlled with the help of medicines.
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