Knowing the common symptoms of tree nut allergies can be very important for keeping yourself and those around you safe.

Tree nut allergies are a growing concern for many people around the world. These allergies occur when your immune system overreacts to proteins found in tree nuts, such as almonds, cashews, and walnuts.

For those who suffer from these allergies, even small amounts of exposure can lead to severe allergic reactions that can be life-threatening. 

See also What Causes Peanut Allergy and How to Prevent it and 25 Types of Nuts.

In recent years, the prevalence of tree nut allergies has increased significantly, making it more important than ever to understand the symptoms and treatment options available for those affected by this condition.

What are Tree Nuts?

Tree nuts are nuts that grow on trees. They shouldn’t be confused with groundnuts that grow on the ground, such as peanuts.

Moreover, peanuts are considered legumes and not nuts, but they can similarly cause allergic reactions. Research shows that 25% and 40% of those allergic to peanuts are also allergic to at least one tree nut.

What are Tree Nut Allergies?

Tree nut allergies occur when your immune system, whose main role is to fight infections, overreacts to the proteins in tree nuts. Tree nuts have various proteins, and one can be allergic to one type of protein or more.

This can result in various allergic symptoms, among them itching and swelling.

Tree nut allergies are common in both children and adults, with about 0.5-1% of people in the US having some form of nut allergies.

According to the American College of Allergy, Asthma, and Immunology, only a few people (less than 10%) outgrow a tree nut allergy, while most will experience it for a lifetime.

While a person can be allergic to one tree nut, another can be allergic to more than one type. So it’s important to know which category you, or the person you know, fall into.

Types of Tree Nuts

There are various types of nuts that grow on trees, including

  • Almond
  • Beech nut
  • Brazil nut
  • Cashew
  • Chestnut
  • Filbert
  • Ginko nut
  • Hazelnut
  • Lichee nut
  • Macadamia nut
  • Pecan
  • Pistachio

Assorted nuts and seeds in wooden bowls, healthy food background.

Symptoms of Tree Nut Allergies

Tree nut allergy symptoms can range from mild to severe depending on an individual’s immune system response to a nut allergen.

Mild Symptoms of Tree Nut Allergies

Mild symptoms of tree nut allergies usually occur within a few minutes to several hours after consuming nuts. These symptoms may include:

1. Itching

Itching is a common symptom of nut allergies. It’s caused by the release of histamines in your body in response to the allergen. Histamine is a body chemical associated with immune responses. It’s also the one responsible for the redness you may often see on the skin during an allergic reaction.

2. Hives (urticaria)

A hive is a skin rash that’s often itchy and usually occurs due to an allergic reaction to consuming particular food or something you’ve touched. It’s common in tree nut allergies and can go away within 24 hours or last longer, often up to 7 days or even more.

Depending on the severity, hives can be as small as a fingertip or as big as a dinner plate.

Like itching, hives occur due to the production of histamine and other chemical messengers.

3. Nasal congestion

Nasal congestion is a condition in which the nasal passages become blocked, making it difficult to breathe through the nose. The most common cause of nasal congestion is common cold, but sinus infections, other respiratory illnesses, or allergies can also cause it.

Some individuals with tree nut allergies may experience nasal congestion or runny nose after eating nuts. The histamine often released in nut allergies has been shown to cause the blood vessels in the nose to swell, making it difficult to breathe through the nose.

Histamine also increases vascular permeability (the movement of fluids through the blood vessel walls), which can also cause nasal congestion or runny nose (rhinorrhea).

4. Digestive issues

Mild digestive problems such as nausea and stomach cramps may also occur in some people with tree nut allergies. These symptoms can occur within minutes or hours of consuming the allergens and can be quite uncomfortable.

In severe cases, you may experience diarrhea and vomiting.

5. Tingling sensation

A tingling sensation in the mouth or throat is another potential symptom when an allergic reaction begins.

The tingling sensation is caused by histamine, which the immune system releases in response to the allergen. Histamine causes the blood vessels to widen and leads to increased blood flow. This increased blood flow can cause a tingling sensation.

6. Swelling

When someone with a nut allergy comes into contact with nuts, their immune system mistakenly identifies them as harmful invaders and launches an attack. This triggers the release of histamines, which lead to inflammation and swelling.

The swelling can occur anywhere on the body but is most commonly seen around the face, mouth, and throat. It may start off as mild redness or puffiness but can quickly progress to severe swelling that affects breathing and requires emergency medical attention.

Heap of assorted nuts close up as background

Severe symptoms of nut allergies

For some people with tree nut allergies, consuming even small amounts of these foods can cause severe allergic reactions.

Here are some severe symptoms associated with tree nut allergies:

7. Anaphylaxis

This is the most severe symptom of a tree nut allergy. Anaphylaxis is a life-threatening reaction that can occur within minutes or up to two hours after eating or coming into contact with the allergen. Symptoms may include difficulty breathing, swelling of the throat and tongue, rapid heartbeat, low blood pressure, and loss of consciousness.

i. Swelling of the throat and difficulty breathing

If you have a severe nut allergy, swelling of your throat or airway can occur. This can happen very quickly after eating nuts or even just inhaling particles from crushed nuts. If this happens, it can be extremely dangerous as it can make it difficult to breathe. If you start experiencing throat swelling, seeking medical attention immediately is important, as this could be life-threatening.

ii. A sudden drop in blood pressure

One of the most dangerous effects of anaphylaxis is a rapid decrease in blood pressure, which can lead to shock and hypotension. This drop in blood pressure happens when the walls of blood vessels dilate, causing them to lose their tone and elasticity.

iii. Rapid heartbeat

One of the less-known symptoms that tree nut allergies can cause is a rapid heartbeat or tachycardia.

When someone with a tree nut allergy consumes nuts, their immune system triggers an allergic reaction, which causes the release of various chemicals and hormones in the body. One such hormone is adrenaline, also known as epinephrine. Adrenaline is responsible for many physiological responses in the body, including increased heart rate.

Adrenaline helps prepare your body for “fight or flight” mode by increasing your heart rate and blood pressure to deliver more oxygen and nutrients to your muscles. In people with tree nut allergies, however, this response can be overactive and lead to rapid heartbeat or tachycardia.

iv. Loss of consciousness

In severe cases of tree nut allergy, the reaction can rapidly progress and affect multiple systems in the body. It causes blood pressure to drop drastically, leading to low brain oxygen levels, causing unconsciousness.

Methods for diagnosing tree nut allergies:

Skin prick allergy to find out kind of allergy

Skin Prick Test

The skin prick test is one of the most common methods used to diagnose tree nut allergies. This test involves placing a small amount of allergen on the surface of your skin and then pricking or scratching it with a needle or lancet. If you are allergic to the substance, you will develop redness, itching, and swelling around the site of the prick.

Blood Test

A blood test measures your body’s immune response to specific allergens by detecting IgE antibodies in your bloodstream. A high level of these antibodies can indicate an allergy to tree nuts.

Oral Challenge Test

An oral challenge test involves eating controlled amounts of the suspected allergen under medical supervision in a controlled environment such as a hospital or clinic setting. The doctor will closely monitor you for any signs of an allergic reaction.

Elimination Diet

An elimination diet involves removing all tree nuts from your diet for several weeks and then gradually reintroducing them one at a time while monitoring for symptoms.

Component Testing

Component testing is another method used to diagnose tree nut allergies where specific proteins within the nuts are tested rather than whole extracts from each nut.

Management of symptoms during an allergic reaction

1. Identify the allergen

The first step in managing an allergic reaction is to identify the allergen that triggers it. Common allergens include pollen, dust mites, pet dander, insect stings, and certain foods like nuts.

2. Avoid exposure

Once you have identified the allergen causing your reaction, try to avoid exposure as much as possible. This may mean staying indoors on days with high pollen counts or avoiding certain foods.

3. Take antihistamines

Antihistamines can help reduce itching, sneezing, and other allergy symptoms by blocking the effects of histamine in the body. They are available over-the-counter at most drugstores.

4. Use nasal sprays

Nasal sprays can help relieve congestion and reduce inflammation in the nasal passages caused by allergies.

Use eye drops: Eye drops can help relieve itching and redness caused by allergies.

Apply creams or ointments. Topical creams or ointments containing hydrocortisone can help reduce itching and inflammation on the skin.

5. Carry an epinephrine auto-injector (EpiPen)

For people with severe allergic reactions (anaphylaxis), carrying an EpiPen is essential as it provides immediate emergency treatment for life-threatening symptoms such as difficulty breathing and swelling of the face or throat.

Auto epinephrine injector. patient doing leg injection

Medical treatment for severe reactions:

Severe allergic reactions, also known as anaphylaxis, can be life-threatening if not treated promptly. If you or someone else experiences severe symptoms such as difficulty breathing, swelling of the face and throat, rapid heartbeat, or a sudden drop in blood pressure after exposure to an allergen, seek medical attention immediately.

The first step in treating anaphylaxis is to administer epinephrine (adrenaline). Epinephrine works quickly to reverse the symptoms of anaphylaxis by constricting blood vessels and opening up airways. It is important to use the auto-injector as soon as possible after experiencing symptoms.

After receiving epinephrine, additional treatment may include:

  • Oxygen therapy: This involves administering oxygen through a mask or nasal cannula to help with breathing difficulties.
  • Intravenous fluids: IV fluids are given to help increase blood pressure and prevent shock.
  • Antihistamines: These medications can help reduce itching and hives that may occur during a severe allergic reaction.
  • Corticosteroids: Steroid medications are used to reduce inflammation in the body and prevent further allergic reactions.
  • Beta-agonists: These drugs are used for asthma-like symptoms such as wheezing or shortness of breath.
  • Monitoring: After receiving initial treatment for anaphylaxis, patients will need to be monitored closely for several hours to ensure that their symptoms do not return or worsen.

Avoidance strategies for people with tree nut allergies:

If you have a tree nut allergy, here are some avoidance strategies that can help you stay safe:

  • Read labels carefully: Always read the ingredients label on the packaged food items before consuming them. Look for any indications of tree nuts or related nuts like almonds, cashews, walnuts, and hazelnuts.
  • Avoid cross-contamination: Be cautious while eating out in restaurants or at friends’ houses, as there could be a risk of cross-contamination with tree nuts. Ask about how the food was prepared and cooked before eating anything.
  • Educate others: Inform your family members, friends, teachers, and colleagues about your allergy so they understand how severe it is and can avoid giving you foods containing tree nuts.
  • Carry emergency medicine: It’s always better to carry an epinephrine auto-injector (EpiPen) if you accidentally ingest any allergens.
  • Choose alternative food options: There are plenty of alternative options available in the market these days that do not contain any tree nuts, like sunflower seeds butter instead of almond butter or soy milk instead of almond milk.
  • Stay alert while traveling: When traveling by air or other modes of transportation where meals may be provided, inform them about your allergy ahead of time so they can make special arrangements for you.
  • Check with manufacturers directly: Contacting manufacturers directly to inquire about their products’ production processes helps ensure that they do not come into contact with tree nuts.

Related Articles:

  1. Common Signs of Food Allergies

  2. Pecan Nutrition and Health Benefits

  3. Are Hazelnuts Good For You?

  4. 8 Incredible Health Benefits of Coconut

Final Thoughts

Tree nut allergies are common food allergies that can result in severe symptoms ranging from mild itching to life-threatening anaphylaxis. The most effective way to manage this allergy is to avoid all types of tree nuts and products containing them. 

If you suspect that you have a tree nut allergy, it is important to consult with your doctor for proper diagnosis and treatment. 

With awareness, caution, and preparedness, individuals with tree nut allergies can lead full and healthy lives while avoiding potentially dangerous reactions.

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