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Doctor insights on: Hypersensitivity Reactions

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What are the common types of hypersensitivity reactions?

What are the common types of hypersensitivity reactions?

Many possibilities: The word "hypersensitivity" often is used to describe an allergic reaction. Possible causes of allergic reactions are sensitivities to foods, insects, medications, etc... ...Read more

Dr. Paul Carter
1,745 Doctors shared insights

Hypersensitivity (Definition)

Hypersensitivity reactions = adverse reactions produced by a normal immune system. ...Read more


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Can you tell me about immunology - hypersensitivity reactions?

Can you tell me about immunology - hypersensitivity reactions?

AKA Allergies: Immunologic hypersenstivity reactions are any reaction that occurs due to an overreaction or inappropriate reaction by your immune system. The most common example is allergies. Other examples include contact dermatitis, chronic hives, large local reactions to insect bites. There are some types of hypersensitivty that do not involve allergy type reactions, but they are rare. ...Read more

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I have a friend who drank on Friday and is having hypersensitivity reactions in his body?

I have a friend who drank on Friday and is having hypersensitivity reactions in his body?

What did he drink?: It is not at all clear to me what he drank or how much he drank? Was it laced with some other drug etc?
Needs to see his doctor for treatment of symptoms and maybe the allergic type symptoms. ...Read more

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Are hypersensitivity reactions are caused by the cross linking of antibodies?

Are hypersensitivity reactions are caused by the cross linking of antibodies?

On the cell surface.: Ige mediated allergic reactions involve 2 ige antibodies directed against the same allergens in close proximetry on the surface of mast cells or basophils. The antibody then fits in between the 2 ige antibodies. That activates the cell to release mediators (chemicals) that directly or indirectly by activating other cells resulting in allergy symptoms. The ige antibodies themselves do'nt cross link. ...Read more

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Is a food allergy similar to or different from contact hypersensitivity reactions?

Is a food allergy similar to or different from contact hypersensitivity reactions?

Different: They are both immune reactions but the similarity ends there. They involve different cells of the immune system, have different symptoms, onset and duration and are treated differently. ...Read more

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What is hypersensitive serum? Doc told I might have that n that's why I get reactions to anti rabies vac like chills fever. Any precaution for last shot

What is hypersensitive serum? Doc told I might have that n that's why I get reactions to anti rabies vac like chills fever. Any precaution for last shot

You'reASensitiveGuy: Means your system is all geared-up for foreign invaders, in this case a vaccine, which is a dead or half-dead invader used to capture whatever other invader you may have been exposed to, or at least get your body even more geared-up for it. Many people get such reactions. Taking some Motrin beforehand and after for a day or two may help a bit. However, if it gets way out of hand call your doctor ...Read more

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What are the symptoms of hypersensitivity to onions?

What are the symptoms of hypersensitivity to onions?

Typical symptoms: Regardless of the food triggering an allergic reaction the allergic reaction consists of some or all of these symptoms: itchy & swollen of lips, tongue, mouth, throat, nausea, vomiting, cramps, diarrhea, hives, swollen face, eyelids, coughing, wheezing, shortness of breath, a sense of doom, dizziness, loss of consciousness. ...Read more

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What is the definition or description of: Hypersensitivity?

What is the definition or description of: Hypersensitivity?

Hypersensitivity: Hypersensitivity reactions = adverse reactions produced by a normal immune system. (i.e., allergies or autoimmunity) ...Read more

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What is the difference between type I hypersensitivity and type ii?

What is the difference between type I hypersensitivity and type ii?

Big difference: Type 1 is mediated by the IgE antibody and responsible for anaphylaxis, hay fever, allerg etc. Allergy skin test can identify these.
Type 2 is mediated by IgG or IgM antibody and complement proteins that are "cytotoxic" that ends up killing the target cell. Examples of this are hemolytic anemia, Graves disease, Myasthenia gravis, Rheumatic heart disease, etc. For anemia, a Coombs test is used ...Read more

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Help please? What is the difference between type I hypersensitivity to type ii?

Help please? What is the difference between type I hypersensitivity to type ii?

Type I is immediate: hypersensitivity reactions, involves IgE with histamine and other mediators release from mast cells, while type II is cytotoxic hypersensitivity reactions involving IgG or IgM bound to cell surface antigens, with subsequent complement (a protein in the blood) fixation, there are also type III and type IV reactions, type I reactions are responsible for immediate allergic symptoms to foods or drugs ...Read more

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Hypersensitive to noise. What can I do?

Hypersensitive to noise. What can I do?

Not an allergy: Consult an ENT surgeon to find out if there is anything wrong with your hearing or ears and follow his/her advice. Until you have been examined, you may use ear protectants. ...Read more

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What is a type 4 hypersensitivity reaction?

What is a type 4 hypersensitivity reaction?

Delayed reaction: Type 4 reactions are delayed reactions involving t cells (i.e. Poison ivy). ...Read more

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What is cytotoxic hypersensitivity (type 2)?

What is cytotoxic hypersensitivity (type 2)?

Type II hypersensitivity: Or cytotoxic reactions, are antibody dependent, IgG or IgM binds to the own body cell surface after being altered by a protein, so the immune system recognizes as non-self (foreign) attacks and destroys the cell by fixing a protein called complement, which in turn forms the Membrane Attack Complex and destroy the cell, the most famous is hemolytic anemias and some auto immune diseases ...Read more

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Why can some people be hypersensitive to pain?

Why can some people be hypersensitive to pain?

Pain.: Pain is a complex psychoocial and physical process that has genetic and racial influences. Certain cultures reports more pain to stimuli than others. Early learning plays a role (modeling). In addition after a lot of pain the nervous system can become sensitized to the pain and either increase or decrease the response to it. ...Read more

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How can I cure my hypersensitivity to insect bites?

How can I cure my hypersensitivity to insect bites?

Desensitization: Allergen desensitization does not work on all allergies--it is most effective with seasonal allergens, indoor allergens and insect bites. Insect bites from bees, red ants and wasps are treated with allergen desensitization. Allergen desensitization uses small amounts of the allergen the person is allergic to and injects the allergen into the individual's body. ...Read more

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What are the symptoms of visceral hypersensitivity?

What are the symptoms of visceral hypersensitivity?

Distension/bloating: Distension --may be pain in the guts, if lower part of guts, then urgency to use no.2
bloating-- may be more gassy but not necessary; may be a abdominal fullness sensation. ...Read more

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Possible hearing hypersensitivity. How do I get tested?

Possible hearing hypersensitivity. How do I get tested?

Audiologist: An audiologist can do a hearing test. If you are concerned about an ear problem, you should see an otologist. ...Read more

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What does it mean if my friend is hypersensitive to touch?

What does it mean if my friend is hypersensitive to touch?

Too sensitive: It means that what you or I might consider a simple touch, your friend might perceive as painful. ...Read more

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What is the difference between hypersensitivity and autoimmunity?

Very different: A hypersensitivity is generally what we call an allergic reaction. This is mostly to things you find in the environment, and most of the time is driven by an antibody called ige. An autoimmune disease is usually driven by igg antibody, and what is being attacked is something in the body that the immune system thinks is "foreign" and should be "dealt with" when it shouldn't be. ...Read more

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Why are some people hypersensitive to pain? Are they just born different?

Probably: Nature versus nurture. In this case it is nature--ie genetically determined reactivity. ...Read more

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Which among the 4 types of hypersensitivity reaction would you think is the worst?

Which among the 4 types of hypersensitivity reaction would you think is the worst?

Type one: Type one reaction can progress to anaphylaxis and can be life threatening ...Read more

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What's the chance of having sensory processing disorder if I have hypersensitivity?

What's the chance of having sensory processing disorder if I have hypersensitivity?

Unanswerable: Please tell us what it is that you are hypersensitive to and then we may be able to answer your question. Please resubmit. Thank you. ...Read more

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What is the disorder when you are hypersensitive to insults or imagined insults? It's a personality thing, right?

What is the disorder when you are hypersensitive to insults or imagined insults? It's a personality thing, right?

Paranoid Personality: People with this disorder show distrust and suspiciousness of others. They can experience this by reading hidden demeaning or threatening meanings into benign remarks or events. ...Read more

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What is coratid sinus hypersensitivity?

What is coratid sinus hypersensitivity?

Easy fainting: Carotid sinuses are bulb like structures in the carotid arteries that contain blood pressure sensors. When blood pressure (bp) increases they send signals to drop the bp. As we get older the arteries become stiff with calcifications and an outside stimulus for instance like when shaving can cause an exagerated response, dropping bp so much that we get nauseated and even faint. ...Read more

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Can IV Flagyl cause hypersensitivity?

Can IV Flagyl cause hypersensitivity?

I V Flagyl: One can be allergic to this medication. ...Read more

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What is acute hypersensitivity pneumonitis?

What is acute hypersensitivity pneumonitis?

Inflammation in lung: Hypersensitivity pneumonitis is a lung disease in which an inhaled substance capable of triggering an immune response called and "antigen" is inhaled and causes an illness that is like pneumonia, with fever, shortness of breath etc. Symptoms resolve when exposure to the antigen is stopped, but repetitive exposure can result in chronic scar formation in the lung. Steroid medicine can also help. ...Read more

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What does a hypersensitive tooth feel like?

What does a hypersensitive tooth feel like?

Sensitive to temps: Hypersensitive tooth means you feel pain or discomfort when eating or drinking hot or cold foods. It can be caused by a cavity, gum or bone disease, erosion of the tooth, or root exposure. Toothpaste which target sensitivity can help but I recommend dental visit to check for decay or infection. ...Read more

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How do you treat hypersensitivity to sound?

Sound hypersentivity: Too broad question. Cause of sensitivity? Treat the cause! Trauma psychological or physical can trigger hyper response to stimuli, even though sound might not have been part of the trauma. Part of hyperarousal, state of hyper stimulation, easily startled...Treat the cause. If cause not found or not remembered (child trauma-abuses), specialists can still help find cause by different modalities. ...Read more

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What could hypersensitivity to beer indicate?

What could hypersensitivity to beer indicate?

Hops or barley: There are some people allergic to hops or barley used to make beer. Its may also be that the alcohol in beer causes nasal congestion that you mistake for allergic rhinitis. Try drinking a clear spirit like vodka or gin. If those cause the same symptoms as beer the cause is the drug effect of alcohol on your nose. ...Read more

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What is causing hypersensitivity pneumonitis?

What is causing hypersensitivity pneumonitis?

Sherlock Holmes: It can be extremely difficulty to identify the source of hypersensitivity penumonitis; there are literally tens and tens of sources for the illness. Some of the top offenders include:
•bird droppings
•humidifiers, heating systems, and hot tubs
•liquid chemicals used in the landscaping and florist industries
•moldy hay, straw, and grain
•chemicals released during the production of plastics and ele. ...Read more

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What does "immune system hypersensitivity" mean?

What does "immune system hypersensitivity" mean?

Overactive against: It means it is overactive toward those immune issues that can be allergy or autoimmune immune responses that can cause you injury Your physician can have you evaluated by an allergist, immunologist or rheumatologist. ...Read more

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What are the symptoms of peanut hypersensitivity?

Peanut allergy: The most serious risk is immidiate allergic responce with swelling of larynx which if not treated can be fatal, and late effects with rash, wheezing and cough are slow to develope and easy to treat. So if you have peanut allergy you carry Epipen (epinephrine) with you all the time. ...Read more