What are the symptoms of an onion allergy?

While onions are not one of the most common food allergens, it is possible for both children and adults to suffer from an allergy to onions. Symptoms of an onion allergy include flu-like symptoms, rash, and inflammation. Depending on the severity of the allergy, victims can also develop a serious condition known as anaphylaxis. Allergy symptoms can appear almost immediately or appear several hours after consumption. Onion allergies can develop during childhood or later in life and may be accompanied by an allergy to garlic, chives and other members of the family Allium .

Many people who suffer from onion allergies experience flu-like symptoms shortly after consuming onions. These symptoms often include upset stomach, diarrhea, and nausea. People who do not suffer from diarrhea may instead become constipated and bloated. Many people also experience headaches, sinus pain, and trouble sleeping. Symptoms range from mild to severe and can last for several hours after consumption.

An allergy to onions can also produce several common allergy symptoms, including hives, itching, and swelling. The lips, throat, and face may be swollen, red, and tender to the touch. It is also common for the eyes to become watery and irritated.

While rare, an allergy to onions can lead to a condition known as anaphylaxis in some people. Anaphylaxis is a serious medical condition that can cause changes in heart rate, shortness of breath, and unconsciousness. A person with this condition may suddenly become dizzy, confused, or very swollen. People who believe they may be suffering from anaphylaxis should seek immediate medical attention as this condition can be fatal.

Symptoms of an onion allergy can develop within minutes to hours after consuming onions. Depending on the severity of the allergy, some people will experience symptoms after cooking with onions or eating onion-flavored foods. Others may consume cooked onions without incident, but develop symptoms after eating raw or undercooked onions. It is also important to remember that people who are allergic to one type of onion may be sensitive to several types of onion. People who have allergies to onions may also be allergic to other members of the family Allium such as chives, garlic and spring onions.

While some people may start showing signs of an onion allergy during childhood, others don't develop this allergy until adulthood. It is possible to develop an allergy suddenly after eating a certain food for years. Since this can make it difficult to identify the allergen, patients may need to contact a doctor or specialist experienced in diagnosing food allergies to help determine the cause of their symptoms.

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