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.
Common symptoms of an allergic reaction include:
sneezing and an itchy, runny or blocked nose (allergic rhinitis)
itchy, red, watering eyes (conjunctivitis)
wheezing, chest tightness, shortness of breath and a cough.
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