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Symptoms of soy allergy

Soy is one of the most frequent causes of allergies in children, and it can start as early as in infancy when babies may get an allergic reaction to infant formula containing soy. By the age of three, most children will stop experiencing these reactions although in some cases it may continue throughout the adulthood as well. Adults can also have soy allergy and reactions range from mild to severe where the person may undergo anaphylactic shock, which can be life threatening. It is important to notify the doctor of any reaction the person might have to soy after which they can take action to prevent future or more severe reactions.


In most cases, soy allergies pass without any serious consequences and signs appear minutes to an hour after the consumption of troublesome food. The person allergic to soy may experience a tingling feeling in the mouth, nausea, vomiting, diarrhea and pains in the abdominal area, while parts of the body such as the face, lips, tongue and throat may start to swell. The person will feel dizzy, light-headed or may even faint and breathing may become difficult, due to a runny nose. Their skin may itch or they can get hives or eczema.

Severe reaction to soy

Rarely, anaphylaxis, a potentially life-threatening reaction occurs. People with asthma and those with peanut and other allergies are at a higher risk of developing the symptoms including a rapid pulse and shock accompanied with the extreme decrease of blood pressure. Their air passages may become blocked and breathing made harder as a result of a swelling or lump in the throat. They can feel dizzy lightheaded or even lose consciousness. Drooling, changes in voice quality and flushing of the entire body are also the signs of a severe reaction.

Soy allergy in infants

Babies who had an allergic reaction to milk-based formula are often switched to a soy-containing alternative, and these are the most common cases in which infants develop an allergic reaction to soy. It is best to see the doctor when the allergic reaction is in progress or a short while after the consumption of soy. In cases of anaphylaxis, it is vital to seek emergency treatment.


In infants, breast-feeding is the only reliable way to prevent soy and other food allergies while adult people with the soy allergy should try to stay away from soy-containing foods by reading the labels. It is essential to refrain from peanuts since soybeans and peanuts have the common allergy inducing constituents. Carrying an emergency shot of epinephrine (adrenaline) can be prescribed to those who are at higher risk of severe reactions. Medical alert bracelet or a necklace is also the way to warn others that an individual may suffers from a serious allergic reaction.

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