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What Are the Signs of an Allergic Reaction to Pineapple?

Andrew Kirmayer
Updated Mar 03, 2024
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The signs of an allergic reaction to pineapple range from an itchy rash or watery eyes to a deadly condition called anaphylaxis. An allergic reaction can cause the entire body to go into shock, which can lead to death. Pineapple reactions are often mistaken for other conditions such as asthma, stomach or intestinal problems, or eczema. Like all allergic reactions, a reaction to eating pineapple occurs because the immune system mistakenly reacts as if a harmful substance has entered the body. A reaction can occur as soon as someone eats the fruit, or it can take place up to five days after consuming it.

People often do not realize that it is pineapple they are allergic to. Upon eating it, someone might get cramps in the lower abdomen. The problem could be mistaken for a stomach virus but can be severe enough that physicians mistake it for other conditions. Constipation can also occur as an allergic reaction to pineapple, or diarrhea might result and be bad enough to cause dehydration. Some people experience swelling in their throat when they eat the fruit, which can make it hard to breath and requires emergency medical care.

Respiratory symptoms are sometimes misdiagnosed as asthma or other serious conditions of the lungs, and often persist over long periods of time before the pineapple allergy is discovered. Less severe symptoms of an allergic reaction to pineapple include watery, itchy, or red eyes; hives on the skin, facial swelling, and tingling in the mouth. Low blood pressure is a symptom in some people which can cause lightheadedness and dizziness. If an anaphylactic reaction occurs, then a person can have so much swelling in the face and throat they can suffocate. Fatal cardiovascular and gastrointestinal effects can also occur with this severe of a reaction.

It is important to be tested for allergies if any reaction is suspected. Anyone who is allergic to nuts and fruit should be aware of the possibility of an allergic reaction to pineapple if they eat it. A severe anaphylactic reaction can be treated with adrenaline, and asthmatic symptoms can be dealt with by taking bronchodilators or other medications used to treat asthma. Antihistamines are also used because the immune system produces histamines in response to the allergy. Mild effects may not have to be treated, but to avoid more serious reactions, a person with a pineapple allergy should avoid the fruit altogether, as reactions can increase in severity with continued exposure.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Andrew Kirmayer
By Andrew Kirmayer
Andrew Kirmayer, a freelance writer with his own online writing business, creates engaging content across various industries and disciplines. With a degree in Creative Writing, he is skilled at writing compelling articles, blogs, press releases, website content, web copy, and more, all with the goal of making the web a more informative and engaging place for all audiences.
Discussion Comments
By anon989632 — On Mar 15, 2015

I get the rash. Thing is, it is only three or four pustules at a time. The are itchy as all get out. And the rash travels over my body. The rash can last up to a month with me.

It does not matter if it is fresh, dried, the juice only. It can be straight as in pineapple only. Or even if it is mixed in something like BBQ sauce. The thing is, my favorite pizza topping was pineapple until I found out that I can no longer have it.

By anon961010 — On Jul 14, 2014

@ddljohn, did your daughter take any antibiotics recently? I'm 42 and have never had problems eating pineapples my whole life until the last five months. I was prescribed a very strong antibiotic and thereafter, I would break out into a pimply rash when I eat pineapples.

I'm not 100 percent sure that it's the antibiotic that has caused me to become allergic to pineapples, but I'm quite sure that the antibiotics destroyed something good in my gut.

By ddljohn — On Mar 09, 2013

Can a pineapple allergy start suddenly?

My six year old daughter has been eating pineapple without problems. But recently, she's started reacting badly to fresh pineapple. She had a piece or two of fresh pineapple twice this month and broke out in a red rash on her face both times.

I don't understand how this allergy developed suddenly. She didn't have such reactions before.

By literally45 — On Mar 08, 2013

@turkay1-- That's not a sign of an allergic reaction. That's called bitter taste syndrome and is often experienced after eating foods which contain certain enzymes. Pineapple is one of those foods. The enzyme in pineapple causes a change in the taste receptors of the tongue and mouth which cause a metallic taste afterward. It doesn't happen to everyone, but quite a few people experience it.

Typical signs of pineapple allergy is itching inside or around the mouth, swelling of the lips and mouth and hives. Hives can happen anywhere on the body. If you don't have any of these symptoms, just the metallic taste, you have nothing to worry about.

By candyquilt — On Mar 07, 2013

I experience a very odd, metallic taste in my mouth immediately after I eat pineapple. It lasts for at least half an hour. It's a very bothersome taste.

I haven't been able to figure out the cause. Could this be sign of an allergy? I don't experience this with any other fruit except for cantaloupe. I have the same problem with cantaloupe.

Andrew Kirmayer
Andrew Kirmayer
Andrew Kirmayer, a freelance writer with his own online writing business, creates engaging content across various...
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