Food Allergy Symptoms That are Red Flags for Your Health

There are mild food allergy symptoms, and there are severe food allergy symptoms. You are probably familiar with most of the common food allergies. But it’s also important that you differentiate between a food allergy and intolerance to food. We’ll touch on that later on, but for now, we must talk about the symptoms of a food allergy. Because some of them can be severe and potentially life-threatening (anaphylaxis for example), it’s important that you notice them and react.

It’s critical that you learn about food allergy symptoms so that you are prepared if the emergency arises. In addition, you should test yourself to see if you are allergic to any food. Recognizing the symptoms will help not only you, but also those around you. If you notice any of the symptoms, you’ll be better prepared to react.

Difference between a food allergy and intolerance to food

The symptoms of food intolerance and food allergy can sometimes be very similar, which is why people often confuse the two. But there’s a huge, crucial difference between a food allergy and food intolerance. For starters, you can tolerate a small amount of the food in question when you are intolerant to food. With a food allergy, you can’t eat a single bite of the food in question without manifesting symptoms later on.

The main difference is in the reaction and what causes the symptoms. With a food allergy, your immune system sends a response to a food protein, triggering your body into an allergic reaction. As we’ll see later on, symptoms of food allergy can include swelling, vomiting, diarrhea, hives, nausea, and others. In some cases, you might experience life-threatening symptoms, like anaphylaxis. Eight foods account for 90% of all the known food allergies: eggs, milk, peanuts, tree nuts, wheat, soy, fish, and shellfish.

On the other hand, a food intolerance is an adverse reaction to a food. A food intolerance reaction does not involve the immune system. Symptoms of food intolerance can manifest up to 20 hours after the food is eaten, whereas the symptoms of a food allergy are often immediate.

Another difference is the symptoms that manifest. Symptoms of food intolerance are often vague and include gastrointestinal problems like bloating, diarrhea, nausea, indigestion. The condition can often mimic symptoms of other medical conditions.

With that in mind, let’s look at the symptoms of food allergies. Knowing these symptoms, and how they manifest, is crucial.

Food Allergy Symptoms


Vomiting is one of the first symptoms of a food allergy. Bear in mind, it can also be a symptom of food intolerance, especially when the food in question is gluten. To determine whether it’s an allergy or intolerance symptom, pay attention to when you vomit. If you vomit just seconds or minutes after eating, it’s most definitely an allergy. It’s recommended that you visit an allergist. If the vomiting is accompanied by other symptoms (like a rash), call 911. Don’t hesitate, as you’ll need to get an epinephrine injection.

Trouble swallowing

Another symptom that’s closely related to the way we digest food is trouble swallowing (this symptom is also called dysphagia, but that’s just a fancy medical term for saying you experience difficulty swallowing food). It might be a problem with your throat, but the reason why you have the problem is that the muscular tube that moves foods and liquids from the mouth to the stomach is affected. Should this symptom arise, you should administer epinephrine immediately and call 911.

Coughing and wheezing

The three symptoms that go hand in hand are coughing, wheezing, and shortness of breath. All of them are linked to your throat and how it reacts to the foods you are allergic to. And bear in mind, while these three seem harmless, they can be quite dangerous symptoms of a food allergy. If the cough is repetitive, you should use epinephrine. Usually, coughing is accompanied by a stomachache.

Stomach cramps

Speaking of accompanying food allergy symptoms, stomach cramps and stomachaches are some of the many that can accompany any other food allergy symptom. You’ll feel your stomach hurting after eating a particular food due to the fact that your stomach can’t break it down. The problem is stomach cramps can be a sign of either a food intolerance or a food allergy. It’s important to know the difference between the two.

Swelling of the tongue

Swelling should be taken seriously, as it’s one of the more severe symptoms of a food allergy. The swelling can spread to the throat and completely obstruct the airway. If you don’t react quickly, you might be unable to speak or breathe shortly after the symptoms arise. Make sure to call the ER and react accordingly.

Pale or blue skin

As we’ve seen, there are many food allergy symptoms that hamper the way your body functions. One thing that happens during a food allergy attack is your body doesn’t get enough oxygen. You simply can’t breathe properly, as we learned earlier. The result is pale or blue skin, a condition also known as cyanosis. It’s caused when the tissues near the skin’s surface don’t have enough oxygen.

Weak pulse and dizziness

If your pulse is weak, the symptoms of your food allergy have gone from mild to severe. The condition should be addressed immediately.

Hives or itchy rash

As mentioned at the beginning, one of the more severe symptoms of food allergy is hives. Usually, whenever some of the mild symptoms (like vomiting and coughing) are accompanied by rashes and hives, the condition is severe, and it’s advisable that you administer epinephrine immediately.

What is anaphylaxis?

This symptom requires its own section, as it’s one of the more severe and possibly life-threatening symptoms of a food allergy. It can come within seconds of exposure to the trigger food. Anaphylaxis can be fatal, and requires an immediate injection of epinephrine.

Known as anaphylactic shock, it develops suddenly and gets worse very quickly. The symptoms of the shock include feeling lightheaded, faint, wheezing, clammy skin, anxiety, confusion, breathing difficulty, collapsing, fast heartbeat, and even losing consciousness.

If someone you know experiences an anaphylactic shock, call the ER immediately, and mention that the person has anaphylaxis. Remove any trigger if possible, and lay the person down flat (assuming they are not unconscious, pregnant, or experiencing breathing difficulties). Usually, a person with food allergies carries an adrenaline auto-injector with him/her. If the person is experiencing anaphylactic shock, use the injector, and give another one after 5-15 minutes if the symptoms don’t improve.

To prevent anaphylaxis, it’s important to identify your triggers, avoid them whenever possible, and always carry an adrenaline auto-injector with you. The last one can potentially save your life.

In addition to foods, anaphylaxis can be triggered by medicines (antibiotics and non-steroidal anti-inflammatory drugs), insect stings, contrast agents (special dyes), latex, and general anaesthetic.

Food Allergy Symptoms That are Red Flags for Your Health

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1 thought on “Food Allergy Symptoms That are Red Flags for Your Health

  1. Thanks for the info. Interestingly enough, many people don’t think that food intolerance is a real thing. I think because the symptoms are not acute and therefore if can be difficult to track issues back to a root cause. They are real and we need to do more to educate people. I appreciate the article. Thanks!

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