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Can Pistachio Nuts Cause Diarrhea?

author image Diane Marks
Diane Marks started her writing career in 2010 and has been in health care administration for more than 30 years. She holds a registered nurse license from Citizens General Hospital School of Nursing, a Bachelor of Arts in health care education from California University of Pennsylvania and a Master of Science in health administration from the University of Pittsburgh.
Can Pistachio Nuts Cause Diarrhea?
A bowl of pistachios on a wooden table. Photo Credit: Liesel_Fuchs/iStock/Getty Images

Pistachio nuts do not commonly cause diarrhea but if you develop diarrhea after eating pistachio nuts, you may have an allergy. The Food Allergy and Anaphylaxis Network states, that more than 1.8 million Americans suffer from a tree nut allergy. Pistachio nuts are a tree nut that can cause common gastric symptoms, such as diarrhea, nausea and abdominal cramping. If you suspect that you have an allergy to pistachio nuts, call your doctor. Stop eating pistachios until you are able to be evaluated.

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Pistachios are considered a tree nut, among hazelnuts, walnuts and almonds. If you’re allergic to one tree nut, you are at high risk of having an allergy to other tree nuts, according to the Food Allergy Initiative. Tree nut allergies are one of the most common food-related allergens among adults that could be a life-long condition, according to the Food Allergy and Anaphylaxis Network.


During an allergic reaction to pistachios, the immune system malfunctions and mistakes the proteins in the nut as a harmful substance. Kids Health explains that the immune system builds a defense system against the proteins by producing specific antibodies call immunoglobulin E, or IgE. IgE antibodies cause mast cells in the gut to produce histamine. Histamine assists the body fight off infection, but in high amounts, it causes inflammation. Inflammation and swelling in the intestines can lead to diarrhea and other gastrointestinal complications.


Gastrointestinal symptoms include vomiting, diarrhea, nausea, abdominal pain, cramping and gas. If you’re allergic to pistachios, you will develop other symptoms alongside having diarrhea. You may also develop skin rashes, tingling in the face, mouth or lips, shortness of breath, wheezing, chest tightness, nasal congestion, sinus pressure and sneezing, according to Kids Health.


Treatment begins with a proper diagnosis. Talk with an allergist about undergoing testing to confirm an allergy to pistachios. If diagnosed, avoid the consumption of all tree nuts. The Food Allergy Initiative states that the Federal Government requires that all food manufactures disclose the use of tree nuts on their packaging. Read all ingredients and when eating out, ask your server to avoid tree nuts.


Diarrhea can lead to weight loss, dehydration and malnourishment. MedlinePlus to increase liquid intake, avoid spicy foods, get plenty of rest and eat bland foods, such as bananas, rice or toast. Use electrolyte sports drinks to maintain proper hydration until you can be seen by your doctor.

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