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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

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

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

Dr. Sheila Smith
1 doctor shared a insight

Severe Allergic Reaction (Anaphylactic Shock) (Definition)

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