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Doctor insights on: Can Anaphylaxis Have A Delayed Onset

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Can anaphylaxis have a delayed onset?

Can anaphylaxis have a delayed onset?

Possibly: Anaphylaxis is a life threatening allergy reaction that occurs within minutes to hours of being exposed to the allergen in question. Very rarely one can see anaphylaxis that is delayed and not occur for a couple of hours after exposure. More commonly one sees anaphylaxis that occurs immediately then the symptoms recur hours later -- this is called a biphasic response. ...Read more

Dr. Kristin Sokol
188 doctors shared insights

Anaphylactic Shock (Definition)

Anaphylaxis is a severe, whole-body allergic reaction to a chemical that has become an allergen. After being exposed to a substance such as bee sting venom, the person's immune system becomes sensitized to it. When the person is exposed to that allergen again, an allergic reaction may occur. Anaphylaxis happens quickly after the exposure, is severe, and ...Read more


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If you have anaphylaxis do you have hives all over your body? Also, how quickly does anaphylaxis happen from a food allergy? What if it is delayed?

If you have anaphylaxis do you have hives all over your body? Also, how quickly does anaphylaxis happen from a food allergy? What if it is delayed?

Anaphylaxis: You can still have it without hives allover, although generalized hives can be part of anaphylaxis but not necessary, anaphylaxis means acclerated allergic reaction affecting vital system and other body organs, the skin is one of them. Allergic food reactions most of the time are within minutes, rarely hours, beyond that reactions aren't of the anaphylaxis magnitude. Avoid triggers, keep epinephrine handy ...Read more

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How quick would anaphylaxis set in after wasp sting? Got stung by 4 yellow jackets about 4 hours ago. Can there be delayed anaphylaxis?

How quick would anaphylaxis set in after wasp sting? Got stung by 4 yellow jackets about 4 hours ago. Can there be delayed anaphylaxis?

Possible: But delayed anaphylaxis is non-existent or rare from stinging insect since it usually occurs within minutes. Can you tell us a little more about your symptoms? In general, later the anaphylaxis occurs the milder the severity. Multiple (likely >10) stings may however cause symptoms from the venom dose even if you were not allergic in the first place. ...Read more

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Wasp sting yesterday upper R arm, area very red/swollen/itchy today (3in diam), some wheezing, SOB, dizziness this AM — delayed anaphylaxis?

Rare but possible: It is exceedingly rare, but not unheard-of, to have delayed anaphylaxis to a sting, and the mechanism, of course, is unexplainable (theoretically, perhaps, T-cell mediated anaphylaxis to peptide components).
Regardless, you should be seen urgently for a proper assessment of your airway, and treatment as indicated. A referral to allergist should be the next step. ...Read more

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What's the best way to stop a food allergy (immediate or delayed, but not anaphylactic shock) reaction?

What's the best way to stop a food allergy (immediate or delayed, but not anaphylactic shock) reaction?

Benadryl (diphenhydramine): If a reaction such as itching happens to a food- an antihistamine like Benadryl (diphenhydramine) may help. However, be careful with food allergies because they can worsen each time you eat that particular food. Therefore, the first time you may feel just mild itching and swelling but the next time it could be a full anaphylactic reaction. The safest thing to do is to avoid the food until you get allergy tested. ...Read more

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Worried about adult onset allergies and anaphylaxis and dieing please help me put my mind at ease very worried and paranoid?

Relax: If you are worried about anaphylaxis from a certain food or medicine, it can be avoided, you can always carry an antihistamine tablets and epinephrine injection for accidental exposure, there are warning signs and can be managed, you may want to see an allergist if you have access to one. If this is not the case, spontaneous anaphylaxis is non-existent as far as I know, otherwise c a psychologist ...Read more

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What do you mean by anaphylaxis?

What do you mean by anaphylaxis?

Life-threatening rxn: Anaphylaxis is a life-threatening allergic reaction affecting several parts of the part simultaneously. Mast cells release histamine & other substances making blood vessels leaky. The plasma leaking out causes swelling in the skin (hives & angioedema) & windpipe (laryngospasm) as well as asthma, vomiting, gut pain. If enough plasma leaks out the patient may go into shock. Death may ensue. ...Read more

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What do nuts trigger anaphylaxis?

What do nuts trigger anaphylaxis?

Any nut can!: Nut allergy can lead to very serious allergic reactions called anaphylaxis. This has been described for multiple nuts. The most common nut to cause reactions is walnuts, followed by cashew, pistachio, almond, pecan and hazelnut. Coconut (some people debate if this is a nut) anaphylaxis is uncommon. Nut allergy is likely to persist and best treated with the help of a board certified allergist. ...Read more

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How do I know if I have anaphylaxis?

How do I know if I have anaphylaxis?

Symptoms: Anaphylaxis is a clinical diagnosis that includes 2 or more organ systems. Systems usually are skin (hives, swelling), respiratory (cough, wheeze), GI (stomach pain), or heart/blood vessel (low BP or loss of consciousness). Skin symptoms are almost always present. The most severe are breathing issues and loss of consciousness. ...Read more

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What is anaphylaxis? Can anyone GT it?

What is anaphylaxis? Can anyone GT it?

Anyone: Anaphylaxis is a life threatening systemic allergic reaction. It can kill. Everyone is a risk for anaphylaxis. If one has suffered anaphylaxis then a thorough evaluation by an allergist is appropriate. ...Read more

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What are the main symptoms of anaphylaxis?

What are the main symptoms of anaphylaxis?

Several: Anaphylaxis commonly manifests in several areas- skin: hives or flushing. Low blood pressure: light-headed, dizzy, passing out. Bronchospasm: wheezing, shortness of breath. Patients also frequently describe a sense of impending doom- "I knew something was really wrong". ...Read more

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How do you know if you are having anaphylaxis?

Bad things happening: Anaphylaxis is a potentially life-ending allergic reaction. Parts of the body involved: skin, heart & respiratory & digestive systems. In anaphylaxis at least 2 are involved. Skin symptoms in 95% — hives, swelling of eyelids, lips, hands, feet or overall flushing. Falling blood pressure, fainting, difficulty breathing through throat or lungs, nausea, vomiting, diarrhea & sense of doom are others. ...Read more

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What is anaphylaxis? Why is it such a big deal?

You can die.: Anaphylaxis is a severe allergic reaction affecting many organs at once. Most serious is swelling shutting off movement of air through the windpipe & leakage of plasma out of the bloodstream leading to catastrophic loss of blood pressure, shock & heart stoppage. Death occurs in 1% of all episodes of anaphylaxis. Its victims are often children and young adults in the prime of life. ...Read more

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If I develop anaphylaxis, how will it be treated?

Anaphylaxis: Epinephrine is the only proven effective treatment for anaphylaxis. There is no data to support any benefit from h1/h2 antihistamines or steroids. We give them to decrease the reaction but only Epinephrine is recommended in anaphylaxis. Give Epinephrine and call 911. Epi only has a half-life of 30 minutes. ...Read more

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What is the definition or description of: anaphylaxis?

Anaphylaxis: Anaphylaxis is a severe, whole-body allergic reaction to a chemical that has become an allergen. After being exposed to a substance such as bee sting venom, the person's immune system becomes sensitized to it.

When the person is exposed to that allergen again, an allergic reaction may occur. Anaphylaxis happens quickly after the exposure, is severe, and involves the whole body. ...Read more

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With anaphylaxis what else should I be concerned about?

With anaphylaxis what else should I be concerned about?

Carry an EpiPen (epinephrine): If you have had anaphylaxis from a food or stinging insect, you should carry an Epinephrine auto injector from now on. You should also undergo a complete evaluation by a board certified allergist to help determine what you may be allergic to and need to avoid. ...Read more

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What should you do if you are experiencing anaphylaxis?

Anaphylaxis: 1. Recognize you are having the reaction
2. Administer Epinephrine immediately (you should have a 2nd dose available too)
3. Call 911 (epi only lasts for 30 minutes). ...Read more

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The usual symptoms of anaphylaxis include what kinds of things?

Life-threatening: Skin: hives, swelling lips, eyelids, hands, feet.
Gi: nausea, vomiting, cramps, diarrhea
breathing: difficulty breathing, coughing, tickle in throat, wheezing, chest pain.
Cardiovascular: rapid pulse, weak pulse, dizziness, sense that something is very wrong, loss of consciousness.
You don't have to have all of these symptoms to have anaphylaxis. Call 911. Lie down. Raise feet on 1 pillow. ...Read more

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Can OAS cause anaphylaxis?

Can OAS cause anaphylaxis?

OAS: I believe you meant to ask if OAS can progress to anaphylaxis? Usually no, but allergic reaction can worsen and progress to be systemic, that depends on the allergen, degree of sensitivity and the amount being exposed to. Better avoid fruits that you know it can cause OAS, in case of accidental exposure, stop eating more, and take an anhistamine ...Read more

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What is idiopathic anaphylaxis?

Unknown cause: Anaphylaxis is the most severe type of allergic reaction and can be life threatening. Anaphylaxis means that after a thorough evaluation for a cause of anaphylaxis the cause still remains unknown. This represents about 66% of all cases of anaphylaxis. ...Read more

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Can methylcobalamine B12 cause anaphylaxis?

Unlikely: I have never heard of methylcobalamin causing anaphylaxis and given that it is a chemical that is naturally found in every cell of your body it is probably impossible to have such a reaction. However, a supplement containing methylcobalamin may contain fillers and binders that some could be allergic to, so one could theoretically have anaphylaxis to a B12 supplement caused by the other ingredients. ...Read more

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What are the first signs and symptoms of anaphylaxis?

Anaphylaxis: Throat tightening, tongue swelling respiratory distress and shock ...Read more

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Is diarrhea in anaphylaxis rare?

Is diarrhea in anaphylaxis rare?

Less common: Diarrhea can occur in anaphylaxis but it is a less common symptom. ...Read more

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Can insect bite cause anaphylaxis?

Can insect bite cause anaphylaxis?

Yes, but...: Yes, but it's unusual. It's more common from stings, due to bees, wasps, hornets, and some species of ants, because they inject a venom that some people are very allergic to. Susceptible individuals carry an "epi-pen" — an injectible cartridge of epinephrine, which counteracts the anaphylactic reaction. And they never forget to apply insect repellent when they go outside. ...Read more

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Can all allergies cause anaphylaxis?

Can all allergies cause anaphylaxis?

Yes.: Anaphylaxis is often an extreme allergic reaction, but may not always be readily attributable to an allergy. Some people, for example, may experience anaphylaxis from exercise under certain circumstances. Most episodes of anaphylaxis may be linked to allergic sensitization as in the case of insect sting reactions, certain drugs, foods, and in some individuals with severe inhalant allergies. ...Read more

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Will anaphylaxis harm my unborn baby?

Will anaphylaxis harm my unborn baby?

Yes: Anaphylaxis in the mother may cause profound distress in the fetus. Be sure to have a couple of Epinephrine injectors with you at all times and take extra precaution on the triggers. ...Read more

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Can sun urticaria cause anaphylaxis?

Not usually: Solar urticaria is not usually associated with anaphylaxis but cold urticaria may. Perhaps extensive exposure can cause problem but most people would have had a sunburn before further complication develops. ...Read more

Dr. Katharine Cox
1 doctor shared a insight

Severe Allergic Reaction (Anaphylactic Shock) (Definition)

A severe, potentially life-threatening allergic reaction. ...Read more