Anaphylaxis: Causes, Symptoms, and Treatment
Medically reviewed by Achuta Uppu, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats Anaphylaxis?
An allergist (a doctor who treats allergies) or an emergency medicine doctor treats anaphylaxis. Since it is an emergency, paramedics and emergency room doctors often give the first care. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What is anaphylaxis?
Anaphylaxis is a serious, life-threatening allergic reaction. It usually affects more than one part of the body at the same time. It often starts within 5 to 30 minutes after contact. Sometimes it takes more than an hour. The immune system is the body's defense system. It overreacts and releases chemicals such as histamine. Histamine makes the airways tighten. It also sets off symptoms across the body. Anaphylaxis can be life threatening and can occur at any time.
Symptoms
Warning signs often affect more than one body part. They may include:
- A red, itchy rash with hives or welts.
- Swelling of the throat, face, eyes, or tongue.
- Wheezing, coughing, or trouble breathing.
- A hoarse voice or trouble swallowing.
- Chest tightness, dizziness, or passing out.
- Stomach cramping, nausea, vomiting, or diarrhea.
- A pale or red face. Also, a feeling of impending doom, which is a strong sense that something bad is about to happen.
It is possible to have a severe allergic reaction without any skin symptoms.
Causes and who gets it
The most common triggers are foods, insect stings, medications, and latex. After a first exposure, the immune system becomes sensitized to the substance. A later exposure can set off the reaction. Some people have an anaphylactic reaction with no known cause. Your risk is higher if you have allergies or asthma and a family history of anaphylaxis. After one episode, the risk of another is increased.
How doctors diagnose it
Doctors look at the symptoms and ask what the person touched, ate, or was stung by. Warning signs in more than one body part point to anaphylaxis. Tests for the allergen may be done after treatment. The allergen is the substance that caused the reaction. An allergist can check past allergic reactions to find the trigger.
Treatment
Anaphylaxis is an emergency that needs medical care right away. Prompt epinephrine (adrenaline) is the main treatment. It is given by an injection into the thigh or as a nasal spray. The FDA (the U.S. Food and Drug Administration) has also approved a nasal spray form (neffy). It is for adults and children who weigh at least 15 kilograms (about 33 pounds). People with certain nasal conditions should ask a doctor about injectable epinephrine instead. Use your epinephrine as your doctor taught you. A second dose may be given if symptoms do not get better or if they get worse.
Do not take an antihistamine or wait to see if symptoms get better. Call 911 or your local emergency number after using epinephrine. While help comes, have the person lie flat and raise the feet about 12 inches. Do not do this if it causes discomfort, if they are vomiting, or if they may have a head, neck, back, or leg injury. Do not give medicine by mouth if they have trouble breathing. At the hospital, staff can help with breathing and give more treatment.
When to see a doctor
Call 911 or your local emergency number right away if you think you or someone near you may be having anaphylaxis. Use epinephrine if you have it. After epinephrine, the person still needs to go to a hospital emergency room.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. This doctor can help you build an anaphylaxis action plan. He or she can also refer you to an allergist for testing and long-term care.
Common questions
How fast does anaphylaxis happen?
Symptoms usually start within 5 to 30 minutes of contact with the allergen. In some cases it may take more than an hour.
What should I do first during anaphylaxis?
Use your epinephrine and call 911 immediately. Do not take an antihistamine or wait to see if symptoms get better.
Can you have anaphylaxis without a rash?
Yes. It is possible to have a severe allergic reaction without skin symptoms.
Who is at higher risk?
If you have allergies or asthma and have a family history of anaphylaxis, your risk is higher. After one episode, the risk of having another is increased.
Sources
- MedlinePlus - Anaphylaxis
- American Academy of Allergy, Asthma & Immunology - Anaphylaxis
- National Library of Medicine DailyMed - NEFFY (epinephrine) nasal spray prescribing information
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
