Can Cashews Cause Diarrhea?

Cashews by themselves do not usually cause diarrhea. However, if you experience diarrhea after eating cashews, it could be due to an underlying condition. In most cases, cashews may lead to diarrhea if you have an allergy to tree nuts — one of the most common food allergies, according to Food Allergy Research & Education (FARE).

Here’s what to know about the connection between cashews and diarrhea, plus how to prevent symptoms from occurring.

What Is a Cashew Allergy?

If you’re allergic to cashews, you may experience diarrhea after consuming the nut. But why? Well, your immune system mistakenly identifies the proteins in cashews as a foreign substance and begins to attack them. The body begins defending itself by producing immunoglobulin E (IgE) antibodies, which cause mast cells (a type of immune cell) to react by creating histamine. This chemical reaction then causes inflammation and swelling in your soft tissue, which can lead to allergy symptoms, according to FARE.

Gastrointestinal Symptoms of a Cashew Allergy

If you have a cashew allergy and eat cashews, your symptoms can vary from mild to severe. Common symptoms of a cashew allergy include coughing, trouble breathing, sneezing, itchy or watery eyes, and hives. However, a cashew allergy can also lead to gastrointestinal symptoms. These include diarrhea, stomach pain, cramps, nausea, and vomiting, according to the American College of Allergy, Asthma & Immunology (ACAAI).

The ACAAI also notes that in some cases, a tree nut allergy can lead to a severe allergic reaction known as anaphylaxis, which can be life-threatening if you don’t seek treatment. According to the Mayo Clinic, common symptoms of anaphylaxis include hives, itchiness, swollen tongue or throat, nausea, diarrhea, dizziness, low blood pressure, and a weak pulse. If you or someone you know is experiencing these symptoms, it’s important to call for medical help immediately.

Complications of Diarrhea

The Mayo Clinic also states that in some cases, diarrhea can lead to dehydration — a serious complication that can be life-threatening without treatment. When you have watery stools with diarrhea, your body loses a lot of fluid. It’s important to revitalize your body with fluids like water, electrolyte drinks, or soups. Without replenishing fluids, you may develop symptoms of dehydration, which may require medical treatment if not managed properly. These symptoms include feeling extremely thirsty, dry mouth, fatigue, dizziness, an inability to urinate completely, or dark urine when peeing.

How to Prevent Cashew Allergy Symptoms

According to the Cleveland Clinic, the best way to prevent symptoms of a cashew allergy — including diarrhea — is to eliminate them from your diet. However, it’s also important to be mindful of other foods that can have cashews in them. These may include trail mix, cereals and protein bars, certain baked goods, and some nut butters. That said, it’s always a good idea to check the labels on food packaging to ensure that you avoid accidentally eating cashews.