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Patient education: Anaphylaxis (The Basics)

Patient education: Anaphylaxis (The Basics)

What is anaphylaxis? — Anaphylaxis is the term doctors use to describe a serious allergic reaction. It can happen very quickly and can cause death. Anaphylaxis can happen after a person:

Eats a food they are allergic to

Takes a medicine they are allergic to

Is stung by an insect they are allergic to

Other triggers can also cause anaphylaxis.

You might know if you are allergic to something. But you can also have anaphylaxis even if you don't know that you have an allergy.

What are the symptoms of anaphylaxis? — Anaphylaxis can involve 1 or more parts of the body. The most common symptoms are:

Hives – These are raised patches of skin that are very itchy (picture 1).

Angioedema – This is a condition that causes puffiness, usually of the face, eyelids, ears, mouth, hands, or feet.

Other symptoms can include:

Redness or itching of the skin (without hives)

Swelling or itching of the eyes

Swelling of the tongue or throat

Trouble breathing, wheezing, or a change in voice

Vomiting or diarrhea

Feeling dizzy or passing out

With anaphylaxis, you can get very sick, very quickly. Your symptoms can also change. You might first get hives on your skin. Soon after that, you might vomit or have trouble breathing. Each time you have anaphylaxis, you can have different symptoms. Symptoms also differ from person to person.

The symptoms you have with anaphylaxis can be worse if you:

Have asthma

Have other health problems such as lung or heart disease

How is anaphylaxis treated? — There are treatments that can help reduce anaphylaxis symptoms quickly. The best treatment is a medicine called "epinephrine." Epinephrine comes in a shot. Ambulance crews and doctors can give it.

People who have had anaphylaxis before often get a prescription for a device called an "autoinjector" (for example, the EpiPen). This device has a shot of epinephrine that you can give yourself. If you have an autoinjector, keep it with you at all times. Use it right away any time you think that you are having anaphylaxis. After you use the autoinjector, call for an ambulance (in the US and Canada, call 9-1-1). That's because the symptoms might come back and you might need more treatment in the hospital. A doctor or nurse will also watch you to make sure that your symptoms do not come back.

Should I see a doctor or nurse? — Yes. If you think that you have anaphylaxis, act fast! If you have an epinephrine autoinjector, use it right away. Then, call for an ambulance (in the US and Canada, call 9-1-1). Do not try to get yourself to the hospital, because you might pass out or stop breathing on the way there. Also, calling an ambulance is usually the fastest way to get help.

Is there anything I can do to prevent anaphylaxis again? — Yes. If you have had anaphylaxis, talk with your doctor or nurse. If needed, your doctor can do tests to find out what you are allergic to.

Your doctor can help you make a plan to prevent future anaphylaxis. As part of your plan, you can:

Learn about the symptoms of anaphylaxis so you know when to get help.

Have an epinephrine autoinjector with you at all times.

Avoid foods, medicines, or insects you are allergic to.

Wear a medical bracelet to let others know about your allergy.

What will my life be like? — Many people who have had anaphylaxis are able to live normal lives. But you might need to make some changes in your life. You need to avoid the things that can cause you to have anaphylaxis. You might need to carry medicine with you in case you have an allergic reaction.

More on this topic

Patient education: Anaphylaxis – Discharge instructions (The Basics)
Patient education: Food allergy (The Basics)
Patient education: Insect bites and stings (The Basics)
Patient education: Peanut, tree nut, and seed allergy (The Basics)
Patient education: Drug allergy (The Basics)
Patient education: Hereditary alpha-tryptasemia (The Basics)
Patient education: Contrast allergy (The Basics)
Patient education: Sulfa drug allergy (The Basics)
Patient education: Penicillin allergy (The Basics)

Patient education: Anaphylaxis symptoms and diagnosis (Beyond the Basics)
Patient education: Anaphylaxis treatment and prevention of recurrences (Beyond the Basics)
Patient education: Allergy to penicillin and related antibiotics (Beyond the Basics)
Patient education: Using an epinephrine autoinjector (Beyond the Basics)

This topic retrieved from UpToDate on: Feb 02, 2024.
Disclaimer: This generalized information is a limited summary of diagnosis, treatment, and/or medication information. It is not meant to be comprehensive and should be used as a tool to help the user understand and/or assess potential diagnostic and treatment options. It does NOT include all information about conditions, treatments, medications, side effects, or risks that may apply to a specific patient. It is not intended to be medical advice or a substitute for the medical advice, diagnosis, or treatment of a health care provider based on the health care provider's examination and assessment of a patient's specific and unique circumstances. Patients must speak with a health care provider for complete information about their health, medical questions, and treatment options, including any risks or benefits regarding use of medications. This information does not endorse any treatments or medications as safe, effective, or approved for treating a specific patient. UpToDate, Inc. and its affiliates disclaim any warranty or liability relating to this information or the use thereof. The use of this information is governed by the Terms of Use, available at https://www.wolterskluwer.com/en/know/clinical-effectiveness-terms. 2024© UpToDate, Inc. and its affiliates and/or licensors. All rights reserved.
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