Allergies occur when your immune system reacts to a foreign substance - such as pollen, bee venom or pet dander - or a food that doesn't cause a reaction in most people. Your immune system produces substances known as antibodies. Some of the symptoms of an allergic reaction include: Itchy, watery eyes.Itchy nose.Sneezing.Runny nose.Rashes.Hives (a rash with raised red patches)Stomach cramps.Vomiting.Peanut allergies are among the most common and most fatal of the food allergies, causing anaphylaxis more often than the other four we mention. For some, even a little contact with peanuts can cause an enormous reaction. Try an over-the-counter remedyOral antihistamines. Antihistamines can help relieve sneezing, itching, a stuffy or runny nose, and watery eyes. ... Corticosteroid nasal sprays. These medications improve nasal symptoms. ... Cromolyn sodium nasal spray. ... Oral decongestants.
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