Allergies are an exaggerated immune system response to an allergen, causing hypersensitivity to substances such as mold, dust, pollen, pet dander or certain foods. Sneezing, watery eyes and wheezing are common. People experiencing trouble breathing should seek immediate medical attention. Related conditions include hay fever, seasonal allergies and allergy-related asthma. Products such as Butterbur, natural allergy formulas and enzymes are listed.
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