Symptoms of an allergic reaction usually develop within a few minutes of being exposed to something you're allergic to, although occasionally they can develop gradually over a few hours. Although allergic reactions can be a nuisance and hamper your normal activities, most are mild. Allergic symptoms Common symptoms of an allergic reaction include: Sneezing Runny, inflamed nose Itchiness in the eyes Teary, red eyes Coughing Itchiness of the roof of the mouth Bronchial asthma symptoms

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Medical Author: Dr. med. Diana Hysi