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Doctor insights on: Onion Allergy Hives

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Hives from down allergy?

Hives from down allergy?

Antihistamine: I woul recommend use of an antihistamine such as Benadryl (diphenhydramine) or zyrtec otc to help relieve the itching usually associated with hives and the rash. Avoiding future contact to prevent them in the future. ...Read more

Dr. John Chiu
2,630 Doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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Are hives a form of allergy?

Are hives a form of allergy?

Yes: Yes hives can be a result of allergy to foods, inhalant allergen or medications. However in many chronic cases (almost 70-80%) an exact cause cannot be detected. It can be very frustrating to the doctor and patient and can be very challenging to find a cause and get it under control. ...Read more

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What causes hives besides allergies?

What causes hives besides allergies?

Several causes: The most common causes of hives are allergy, autoimmunity, and physical stimuli. Foods or drugs can cause hives - peanut and shellfish are common food allergens, and Ibuprofen and penicillin are common drug allergens. Some hives are due to physical stimuli such as cold, heat, pressure or stroking of the skin. ...Read more

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Can hives be symptoms of dog allergies?

Can hives be symptoms of dog allergies?

Yes if when with dog: Any severe allergy can cause hives in the allergic person, so yes, hives could be due to a dog. More people are allergic to cats than are allergic to dogs, by a large percentage, but some people have life- threatening dog allergies. Severe reactions can include eye swelling, throat- closing, coughing and asthma, and shock, as well as skin rashes including hives. ...Read more

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Which type of medicines work for "hives" allergies?

Which type of medicines work for "hives" allergies?

Antihistamine: It depends on what the cause for your hives may be. Unfortunately, although hives can usually be controlled with antihistamine, we often can't find the cause for them. If the hives have lasted over 6 weeks, see an allergist. Otherwise, keep on scratching if otc antihistamine fails. ...Read more

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I have tested for some allergies and it has become negative but still occasionaly get hives?

I have tested for some allergies and it has become negative but still occasionaly get hives?

See below: The most common reason for chronic hives is idiopathic, no known cause. Discuss with your allergist if further testing is warranted. ...Read more

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I have a mastiff that causes hives only when she puts her paws on me. Is this a mild form of allergy?

Yes: This type of contact allergy to dogs is very common, you may have subtle nasal symptoms that you do not attribute to it, but see if you feel better when on vacation without your dog. Getting tested by an allergist will give you the definite answer and help to manage it. ...Read more

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What are the causes of daily hives. I know its an allergy to something but having no luck with testing.?

What are the causes of daily hives. I know its an allergy to something but having no luck with testing.?

Chronic urticaria: Sounds like you have chronic urticarial. While allergies may play a role of causation in many of these cases, others are caused by environmental circumstances - hot or cold environment, stress, or other non-allergic conditions. Still best to work with allergist to find out what your triggers may be and explore alternative options for treatment. ...Read more

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I break out in very bad large hives. Itch terribly. I have been allergy tested, all neg. What may b cause?

I break out in very bad large hives. Itch terribly. I have been allergy tested, all neg. What may b cause?

Damn hives: Most people that have chronic urticaria, hives lasting more than 6 weeks, have ciu, chronic idiopathic urticaria. Allergy is probably responsible for only 5 - 10% of ciu. Recent data suggests some chronic hives are autoimmune and occasionally they can be a marker of other systemic diseases. A good history will usually direct evaluation if any. Controlling medications reason for allergist consult. ...Read more

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What makes hives come out, and do the different types of allergies cause different sizes or different types of hives?

What makes hives come out, and do the different types of allergies cause different sizes or different types of hives?

Various: Hives can be caused by exposure to allergens in the environment, or various internal problems such as autoimmune to thyroid problems. Unfortunately, the size, location, and distribution of hives do not offer any clues as to why they're there. ...Read more

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Broke out into hives, maybe 40 over body. Its been 2 days. Should I be worried and see a Dr? Or just take OTC allergy meds and it should go away?

Broke out into hives, maybe 40 over body. Its been 2 days. Should I be worried and see a Dr? Or just take OTC allergy meds and it should go away?

Depends on trigger: Urticaria (hives) is common, affecting up to 20% of the population. Acute hives is defined as periodic outbreaks of red, raised itchy lesions that resolve within 6 weeks. Common viral and bacterial infections can trigger an outbreak, however medications, foods, and insect stings can also cause acute hives but have the potential to lead to more serious complications. ...Read more

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I get hives everyother day and I have been tested for allergies but they found none, the dr says he can't help me any further. Is there anything else?

I get hives everyother day and I have been tested for allergies but they found none, the dr says he can't help me any further. Is there anything else?

Yes: Although a cause for chronic hives is often unknown, a majority of the hives can be controlled with medications and other treatments. Allergy skin testing is rarely helpful in evaluating chronic hives and thus your negative tests were not unexpected. Consult an allergist and in the meanwhile try taking your antihistamine up to 4 x daily regularly. Don't despair. ...Read more

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What to do for allergy shiners and hives?

What to do for allergy shiners and hives?

Allergic shiners: Those dark circles under the eyes are commonly called allergic shiners. They are due to back up of blood in the small blood vessels due to significant nasal congestion. It takes a while, but with treatment of the nasal congestion, the "allergic shiners' will gradually improve. Hive are usually treated with antihistamines and finding the cause of the hives so avoidance measures can be done. ...Read more

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Chronic hives and lots of allergies. Why is this happening?

Chronic hives and lots of allergies. Why is this happening?

See an allergist: Hives can be related to your allergies, or can have a mind of their own. To get some answers to your questions, you ought to consult an allergist. Your genes and environment are to blame as the cause of your allergies. ...Read more

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How can I tell if I have hives or a drug allergy?

How can I tell if I have hives or a drug allergy?

Subtle: hives can occur as part of an allergy syndrome. People with chronic hives or who have an inborn low threshold for hives have difficulty differentiating simple hives from drug allergy. If the drug reaction is IgE-mediated, or occurs via a similar pathway without IgE, then one would expect additional symptoms other than hives (breathing problem, dizzy, nausea, swelling, headache, etc) ...Read more

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What's the most commonly used allergy test if hives?

What's the most commonly used allergy test if hives?

All of them.: If someone has hives that are consistent with allergy, they may be tested to most of the food allergens if it is unclear which foods are the likely culprits. However, frequently people that have hives due to allergy have a pretty good idea which food or foods may be the cause. Most common food allergens are milk, egg, wheat, corn, soybean, peanut, tree nuts, and shellfish. ...Read more

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Severe mushroom allergy would mean more than just hives?

Anaphylaxis perhaps: That's the name for severe allergic reactions. Any reaction that is very severe can progress to life-threatening symptoms like throat closing, hoarseness, chest tightness, asthma, or circulatory collapse (shock). Skin manifestations like hives are not usually dangerous; just uncomfortable and unsightly. ...Read more

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Would I have an increased risk of hives if I have allergies?

Not necessarily: Just because one may have allergies does not mean that one will be at higher risk for hives. ...Read more

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Do you know any way to see what caused these hives without an allergy test?

Do you know any way to see what caused these hives without an allergy test?

Depends on trigger: Urticaria (hives) is common, affecting up to 20% of the population. Acute hives is defined as periodic outbreaks of red, raised itchy lesions that resolve within 6 weeks. Common viral and bacterial infections can trigger an outbreak, however medications, foods, and insect stings can also cause acute hives. An Allergist might determine cause of hives without testing, but depends on clinical history ...Read more

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What can I do to help my allergy hives when no OTC medicine or cream seems to help?

See an allergist: The best treatment for hives is to avoid whatever is causing them; an allergist can help with the identification. In the majority of cases in which no cause can be identified, prescription medications can be vastly more effective than what is available over the counter. ...Read more

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Are mild hives ever just a "side effect" of a med, or are they always an "allergy"?

Are mild hives ever just a "side effect" of a med, or are they always an "allergy"?

Hives: When hives are caused by a drug, the mechanism is usually an allergic reaction. We generally would consider a hive reaction to be allergy rather than side effect. ...Read more

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Is there a way to get tested for solar allergy? I get hives everytime I'm out in the sun.

Is there a way to get tested for solar allergy? I get hives everytime I'm out in the sun.

See allergist: There are different types of solar allergy and your best bet would be consulting an allergist. ...Read more

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Is it possible to get hives for no reason? I have no allergies, but break out in them occasionally.

Is it possible to get hives for no reason? I have no allergies, but break out in them occasionally.

That's usually the case: Most of the time hives have no clear reason, there are different forms of hives (urticaria) with different known reasons, sometimes hidden, if you really suffer, having those hives more often and for prolonged periods, or not controlled, see an allergist. Check aaaai. Org or acaai. Org for an allergist in your area, good luck ...Read more

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What are the symptoms of an allergy to cats if you usually are fine with cats, but got hives visiting another cat?

What are the symptoms of an allergy to cats if you usually are fine with cats, but got hives visiting another cat?

Depends: Most typical allergic symptoms to cat are nasal, like hay fever, or asthma. There may some species that may cause more severe symptoms. One can have hives with contact to dander or saliva, or may possibly be a sign of a more severe reaction. If symptoms begin without seeing or touching the animal, allergic sensitivity may be quite severe. ...Read more

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Started having hives/itching. They come on at any time. Normal allergies have never been this way. It can start on any part of the body.

Started having hives/itching. They come on at any time. Normal allergies have never been this way. It can start on any part of the body.

Urticaria: 50% of the time one would never know the cause of allergic reaction. Spontaneous or idiopathic urticaria (for now) could be due to heat, cold, exposure to sun, any specific ingredient in the food that you are taking, detergent, air born (from the tree or grass). If they are happening very frequently or severely then you need to see the doctor to determine the cause. ...Read more

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I'm getting hives all over my body and I've already had all kinds of allergy test and it all came back negative, I don't know what else to do?

I'm getting hives all over my body and I've already had all kinds of allergy test and it all came back negative, I don't know what else to do?

See a dermatologist: Chronic urticaria is not an allergy. See a dermatologist for precise diagnosis. Be sure to bring with you all pills, vits, meds, creams that have been used for any reason. Meanwhile try zyrtec (cetirizine) (certirazine) 1 to 3 a day. ...Read more

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I had an allergy shot two days ago. Had a site reaction larger than a half dollar-remains. Today woke up with hives on body and face. Related?

I had an allergy shot two days ago. Had a site reaction larger than a half dollar-remains. Today woke up with hives on body and face. Related?

Possible: Allergy shots may be associated with a late-phase reaction which comes on several hours after (local reaction). But it is highly unusual to develop hives 2-3 days later. I suspect that something like a viral infection may be the cause for your hives. ...Read more

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Daughter had hives on and off for 5 days last week and now my other child is getting neither has any allergies. What kind of illnesses can cause this?

Daughter had hives on and off for 5 days last week and now my other child is getting neither has any allergies. What kind of illnesses can cause this?

Viral illness: I suspect a viral illness. This would be a ready explanation since they both have a suggestion there is a contagious component ...Read more

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I'm 42, I have had chronic hives since I was 19. 1-2 episodes a year, each episode lasting 3-4 months. I have them now. On every allergy med. Help me pls?

Try antihistamine: Given that you have hashimoto's, the problem is likely an autoimmune one. Since it has been present for over 20 years without causing any damage, consider taking an antihistamine up to 4 doses per day. However you should try to find something without the drowsy effect of Benadryl (diphenhydramine) if possible. ...Read more

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Citalopram allergy = hives?

Citalopram allergy = hives?

Very rare: According to fda data less than 1% of individuals develop urticaria (hives) or anaphylaxis with citalopram. Citalopram can be ruled out as the cause of any anaphylaxis, skin rash or hives you develop after you have been on it for over 1 year. ...Read more

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What allergy gives you hives on your stomach & folds of the arm?

Not specific: Allergy or allergy reactions are not specific to a particular food, allergen or drug. Meaning one can't say egg will give hives on arms and milk will give hives on face. If hives persist then one should be evaluated. ...Read more

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How long do penicillin allergy hives take to clear?

Varies: Hives due to drug allergy usually improve within a day or two of stopping the medicine but can last as long as a week or two. It is best to call the doctor to determine what treatment is needed. ...Read more

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My hives got significantly bigger after allergy testing. What should I do?

Call your allergist: The purpose of going to be tested is to determine your allergies and the doctors office most likely marked the spots. Typically the office will instruct you on what to expect and what to do following the testing. ...Read more

Dr. Sanjiv Kaul
3 Doctors shared insights

Hives (Definition)

An outbreak of red bumps or wheals that appear quickly after exposure to certain allergens (foods, medications, other substances). They can vary in size, are itchy, can burn, and can last for up to ...Read more