If you have a peanut allergy, you may also have an allergy to certain tree nuts, like cashews, hazelnuts or walnuts, because they all contain similar proteins.

What are the symptoms of a walnut allergy? Continue reading to find out.

Skin Symptoms

Skin irritation is the most common symptom of any food allergy. Those with walnut allergies may experience itching and swelling on the face or around the mouth, as well as on the tongue, gums and throat. Eyes may become itchy and irritated and may swell or fill with water. Also, you may break out in hives on other areas of the body or develop eczema.

Respiratory Symptoms

Patients with a walnut allergy may experience symptoms of Hay fever, including sneezing, coughing and wheezing when the body produces histamines in response to the proteins found in walnuts. Your nose may run or you may experience chest and sinus congestion. For those with asthma, an allergic reaction could also trigger an asthma attack.

Gastrointestinal Symptoms

You may also experience gastrointestinal symptoms including cramping, gas and bloating, or diarrhea and vomiting. Many times, people will confuse an allergic reaction to a certain food with food poisoning. If you are experiencing an allergic reaction to a particular food product, you will most likely experience gastrointestinal symptoms in addition to skin inflammation and respiratory problems.

Cardiovascular Symptoms

Sometimes during a reaction, cardiovascular symptoms will occur. Your blood pressure can reach dangerously low levels, and you may faint or experience lightheadedness. Your heartbeat can also increase rapidly.


In severe cases, your throat, tongue and lungs will swell to the point where you can no longer breathe, and your blood pressure will decline rapidly. This condition is known as anaphylaxis and is a medical emergency. If this occurs, seek medical attention right away.

Other Symptoms

Those with walnut allergies may also experience headaches and may become irritable or fatigued. These symptoms are often very mild and will go away after several hours. Often times, people will not realize that these symptoms are associated with the consumption of walnuts unless these symptoms become worse or are accompanied with other, more acute symptoms.

Don’t Ignore the Signs

Some will have mild reactions to walnuts and will continue to ignore them. If you exhibit any signs of a reaction, it is important to go to an allergist or your primary care physician and stop eating walnuts until you get a proper diagnosis. Also remember that if you have several exposures to walnuts with only mild reactions, you can eventually experience a more severe, life-threatening reaction.

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