7 Uncommon Food Allergies That Could Be Causing Your Symptoms

You hear a lot about the most common food allergies, which include: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybeans. However, there are many other foods that can cause an allergic reaction, including some you wouldn't suspect, such as citrus and celery.

In fact, according to the Centers for Disease Control and Prevention (CDC), more than 170 foods have caused food allergy reactions, demonstrating that many people react to foods that are outside the realm of the usual food allergens.

In many cases, these reactions are caused by a condition that's known as oral allergy syndrome (OAS) or pollen-food allergy syndrome.

Citrus fruit surrounding a glass of fruit juice
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Food Allergies and Cross-Reactivity

People who have oral allergy syndrome generally already have been diagnosed with inhaled allergies to allergens such as tree, weed, or grass pollen. Some foods contain proteins that are similar in structure to these inhaled allergens, and people with OAS also can react with food allergy symptoms when they consume those foods, because of those similar proteins. This is a process known as cross-reactivity.

In other words, people with OAS have an allergy to inhaled plant materials, and because of that allergy, may also exhibit food allergy symptoms to certain foods that come from plants that are closely related.

Cross-reactivity has been documented between birch pollen, mugwort pollen, grass pollens, ragweed and Timothy grass with a variety of fruits, legumes and grains, nuts and seeds, and vegetables, herbs, and spices. The patterns and prevalence of cross-reactivity vary across the world, due to geographical and climatic differences.

Common Foods Related to Oral Allergy Syndrome

Here are some of the most common foods related to OAS:

Apples

About 50% to 75% of people with an allergy to birch pollen and mugwort pollen also react to raw apple due to oral allergy syndrome.

Symptoms of apple allergy primarily reside within the mouth and can occur within five minutes of eating the offending food in those who are the most sensitive. Nearly all individuals will experience symptoms within 30 minutes of eating. Symptoms tend to resolve once the individual stops eating the apple. Severe reactions are possible, particularly if throat swelling is involved since this can cause breathing difficulty.

Citrus

An allergy to citrus fruits may include one or more of the following types: orange, grapefruit, lemon, and lime. Reactions can range from an itchy mouth to full-fledged anaphylaxis. There is cross-reactivity between citrus fruit, suggesting the allergy to one citrus fruit increases the likelihood of allergy to another citrus fruit. Grass pollens, Timothy grass, birch pollen, and mugwort pollen may cross-react with citrus fruit due to their similar protein make-up.

Bananas

Allergic reactions to banana vary widely and may include itching of the mouth and throat, hives (urticaria), swelling (angioedema), and wheezing. Symptoms are most closely related to oral allergy syndrome, with localized symptoms in the mouth. In most cases, symptoms begin within minutes of eating the fruit.

Cross-reactivity between ragweed and banana is known to play a role.

If you have a banana allergy you also may react to natural rubber latex. Latex is produced from the sap of the rubber tree, which contains similar proteins to those in bananas and other related foods, such as kiwi and avocado.

Spices

Coriander is in the family of spices that includes caraway, fennel, and celery—all of which have been associated with allergic reactions. Cinnamon, saffron, and mustard also have been noted for causing reactions.

Across the globe, spices have become some of the most common food allergens. It appears that cross-reactivity to birch pollen, mugwort pollen, grass pollens, and Timothy grass are the most common culprits.

Celery

A celery allergy is relatively common, making celery a top allergen. Cross-reactivity to birch pollen and mugwort pollen, as well as grass pollens and Timothy grass have been identified. According to some research, 30% to 40% of allergic individuals are sensitized to celery.

Coconut

Coconut allergy is very rare. According to the FDA, coconut is classified as a tree nut for the purposes of ingredient labeling and consumer protection. Coconut is not a tree nut, however, and most individuals with tree nut allergy can eat coconut without issue. While few individuals will have a coconut allergy, they do exist.

Meat

Meat allergy is uncommon but some individuals have an allergy to meat, beef, lamb, pork, and goat. A red meat allergy to beef and pork is associated with a tick bite from the Lone Star tick. This tick can be found in the Southeast, from Texas up to New England.

Reactions to red meat are often delayed, occurring many hours after eating red meat, although this isn’t always the case. Common symptoms include nausea, vomiting, and diarrhea, with the most common being itching. An anaphylactic reaction may occur in individuals who exercise after ingesting red meat.

If you develop an allergy to one type of meat, you may develop an allergy to another type of meat, such as poultry. A very small number of children who are allergic to milk may also be allergic to meat.

The delay between eating red meat and symptoms makes diagnosing red meat allergy challenging. However, individuals with a true red meat allergy will test positive following an immunoglobulin E skin prick test.

Latex

When individuals who are allergic to latex consume a food containing a similar antigen (protein responsible for an allergic reaction), symptoms develop. This is called latex-fruit syndrome.

Not all people who are allergic to latex will have this condition. Between 30 and 50% of individuals with a natural rubber latex allergy are sensitized to other foods, especially fruit. It's most common to see cross-reactivity with avocado, banana, cassava, chestnut, kiwi, mango, papaya, passion fruit, tomato, turnip, zucchini, bell pepper, celery, potato, and custard apple. However, sensitivity to various other foods has been recorded.

If a latex-allergic person has had a reaction to a food, he or she should avoid that food. If there is doubt, an oral challenge test of the food should be performed under the supervision of a doctor.

A Word From Verywell

If you have a respiratory allergy to common pollens, such as birch, mugwort, grass, or ragweed, you should be aware of the possibility of oral allergy syndrome.

Talk to your doctor if you've ever experienced symptoms following one of these potentially cross-reactive foods. In addition, if you eat one of these foods and then have severe symptoms, such as throat swelling or difficulty breathing, seek emergency medical care.

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