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A soy allergy is a very common food allergy which develops in response to exposure to certain proteins found in soy beans. Infants and children are most prone to developing soy allergies, and they often outgrow them by age five, but the allergy can persist into adulthood. The severity of a soy allergy can vary considerably, from mild discomfort experienced after eating soy products to more serious complications like anaphylactic shock and death.

Like other food allergies, a soy allergy develops when the body's immune system identifies soy as harmful, developing antibodies to certain proteins found in soy beans. When the body is exposed to these proteins, a cascading reaction starts as the immune system tries to neutralize the invader and goes haywire. This reaction causes a number of symptoms.

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Soy allergy is an immune system response to soy protein that the body mistakenly believes is harmful. Once the immune system decides that soy protein is harmful, it creates specific antibodies to it. The next time the individual eats soy, the immune system releases massive amounts of chemicals, including histamine, in order to protect the body. These chemicals trigger a cascade of allergic symptoms that can affect the respiratory system.The reported symptoms of soy allergy include: acne, angioedema, rhinitis, anaphylaxis, asthma, atopic dermatitis, bronchospasm, colitis, conjunctivitis, diarrhea, diffuse small bowel disease, dyspnea, eczema, enterocolitis, fever, hypotension, itching, laryngeal edema, lethargy, pollinosis, urticaria, vomiting, and wheezing. If you suspect that you or your child may have soy allergy.