What are the most common allergies that cause hives
The purpose of the immune system is to defend itself and hold microorganisms, such as certain bacteria, viruses, and fungi, out of the body, and to destroy any infectious microorganisms that do invade the body. The immune system is made up of a complicated and vital network of cells and organs that protect the body from infection.
The organs involved with the immune system are called the lymphoid organs. They affect growth, development, and the release of lymphocytes (a type of white blood cell). The blood vessels and lymphatic vessels are significant parts of the lymphoid organs.
They carry the lymphocytes to and from diverse areas in the body.
Each lymphoid organ plays a role in the production and activation of lymphocytes.
Lymphoid organs include:
Blood vessels (the arteries, veins, and capillaries through which blood flows)
Peyer’s patches (lymphoid tissue in the little intestine)
Adenoids (two glands located at the back of the nasal passages)
Spleen (a fist-sized organ located in the abdominal cavity)
Lymph nodes (small organs shaped love beans, which are located throughout the body and join via the lymphatic vessels)
Thymus (two lobes that join in front of the trachea behind the breast bone)
Appendix (a little tube that is connected to the large intestine)
Lymphatic vessels (a network of channels throughout the body that carries lymphocytes to the lymphoid organs and bloodstream)
Bone marrow (the soft, fatty tissue found in bone cavities)
Tonsils (two oval masses in the back of the throat)
Main allergy symptoms
Common symptoms of an allergic reaction include:
- itchy, red, watering eyes (conjunctivitis)
- swollen lips, tongue, eyes or face
- sneezing and an itchy, runny or blocked nose (allergic rhinitis)
- tummy pain, feeling ill, vomiting or diarrhoea
- a raised, itchy, red rash (hives)
- wheezing, chest tightness, shortness of breath and a cough
- dry, red and cracked skin
The symptoms vary depending on what you’re allergic to and how you come into contact with it.
For example, you may have a runny nose if exposed to pollen, develop a rash if you own a skin allergy, or feel sick if you eat something you’re allergic to.
See your GP if you or your kid might own had an allergic reaction to something. They can assist determine whether the symptoms are caused by an allergy or another condition.
Read more about diagnosing allergies.
What is anaphylactic shock?
Anaphylactic shock, also called anaphylaxis, is a severe, life-threatening reaction to certain allergens.
Body tissues may swell, including tissues in the throat. Anaphylactic shock is also characterized by a sudden drop in blood pressure. The following are the most common symptoms of anaphylactic shock. However, each person may experience symptoms differently. Other symptoms may include:
Difficulty breathing or shortness of breath
Itching and hives over most of the body
Loss of consciousness
Pain or cramps
Nausea, vomiting, or diarrhea
Swelling of the throat and tongue or tightness in throat
Abnormal heart rate (too quick or too slow)
Anaphylactic shock can be caused by an allergic reaction to a drug, food, serum, insect venom, allergen extract, or chemical.
Some people who are aware of their allergic reactions or allergens carry an emergency anaphylaxis kit that contains injectable epinephrine (a drug that stimulates the adrenal glands and increases the rate and force of the heartbeat).
For information about food allergies please visit the following pages:
Duration of Hives
“A hive lesion doesn’t generally final much longer than 24 hours, whereas things love bug bites, which are easily confused with hives, can final several days,” Friedman says.
That means you might wake up with a hive one morning — and that one specific hive may be completely gone by the next morning, Friedman says. “And they often appear without any warning.”
Hives also move around, and they don’t necessarily care what body part they inhabit. Even your scalp, soles of your feet, and palms of your hands can get hives. “If you see one moving a lot, that signals a hive,” Friedman says.
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Acute hives final less than six weeks, while chronic hives final more than six weeks.
That doesn’t mean you’re covered in hives every day during these time periods, but it does mean that during these time frames, the hives come and go either erratically or sometimes on a more consistent basis, says Anthony M. Rossi, MD, an assistant attending dermatologist at Memorial Sloan Kettering Cancer Middle in New York City.
Fortunately, although they might itch a lot, hives don’t leave any marks on the skin once they vanish, regardless of whether you’ve treated them or not.
Hives are neither contagious nor, in most cases, dangerous.
There are, however, a few exceptions that should immediate emergency care.
The first is a condition called angioedema, which involves swelling of the tissue beneath the skin. That can lead to swelling in the tongue, lips, throat, hands, feet, and even the inside of the abdomen.
As a result, people could own stomach cramps or worse, difficulty breathing. People with hives can own angioedema, but note that “just because you own hives doesn’t mean you’ll get angioedema,” Dr. Rossi says.
When hives are accompanied by swelling and breathing becomes hard, seek emergency care correct away.
Hives may also be the result of a serious allergic reaction called anaphylaxis, Rossi says. If you experience difficulty breathing; swelling of your lips, tongue, or eyelids; dizziness; abdominal pain; or nausea or vomiting in conjunction with hives, seek assist immediately.
For other uses, see Hive (disambiguation).
Hives, also known as urticaria, is a helpful of skin rash with red, raised, itchy bumps. They may also burn or sting. Often the patches of rash move around. Typically they final a few days and do not leave any long-lasting skin changes. Fewer than 5% of cases final for more than six weeks. The condition frequently recurs.
Hives frequently happen following an infection or as a result of an allergic reaction such as to medication, insect bites, or food.Psychological stress, freezing temperature, or vibration may also be a trigger. In half of cases the cause remains unknown. Risk factors include having conditions such as hay fever or asthma. Diagnosis is typically based on the appearance.Patch testing may be useful to determine the allergy.
Prevention is by avoiding whatever it is that causes the condition. Treatment is typically with antihistamines such as diphenhydramine and ranitidine. In severe cases, corticosteroids or leukotriene inhibitors may also be used. Keeping the environmental temperature cool is also useful. For cases that final more than six weeks immunosuppressants such as ciclosporin may be used.
About 20% of people are affected. Cases of short duration happen equally in males and females while cases of endless duration are more common in females. Cases of short duration are more common among children while cases of endless duration are more common among those who are middle aged. Hives own been described at least since the time of Hippocrates. The term urticaria is from the Latinurtica meaning «nettle».
Severe allergic reaction (anaphylaxis)
In rare cases, an allergy can lead to a severe allergic reaction, called anaphylaxis or anaphylactic shock, which can be life threatening.
This affects the whole body and usually develops within minutes of exposure to something you’re allergic to.
Signs of anaphylaxis include any of the symptoms above, as well as:
Anaphylaxis is a medical emergency that requires immediate treatment.
Read more about anaphylaxis for information about what to do if it occurs.
Sheet final reviewed: 22 November 2018
Next review due: 22 November 2021
Allergic disease is one of the most common chronic health conditions in the world.
People with a family history of allergies own an increase risk of developing allergic disease. Hay fever (allergic rhinitis), eczema, hives, asthma, and food allergy are some types of allergic diseases. Allergy symptoms can range from mild to a serious, life-threatening allergic reaction (anaphylaxis).
Allergic reactions start in your immune system. When a harmless substance such as dust, mold, or pollen is encountered by a person who is allergic to that substance, the immune system may over react by producing antibodies that «attack» the allergen.
The can cause wheezing, itching, runny nose, watery or itchy eyes, and other symptoms.
How does a person become allergic?
Allergens can be inhaled, ingested, or enter through the skin. Common allergic reactions, such as hay fever, certain types of asthma, and hives are linked to an antibody produced by the body called immunoglobulin E (IgE). Each IgE antibody can be extremely specific, reacting against certain pollens and other allergens. In other words, a person can be allergic to one type of pollen, but not another. When a susceptible person is exposed to an allergen, the body starts producing a large quantity of similar IgE antibodies.
The next exposure to the same allergen may result in an allergic reaction. Symptoms of an allergic reaction will vary depending on the type and quantity of allergen encountered and the manner in which the body’s immune system reacts to that allergen.
Allergies can affect anyone, regardless of age, gender, race, or socioeconomic status. Generally, allergies are more common in children. However, a first-time occurrence can happen at any age, or recur after numerous years of remission. Hormones, stress, smoke, perfume, or environmental irritants may also frolic a role in the development or severity of allergies.
Signs and symptoms
Welts (raised areas surrounded by a red base) from hives can appear anywhere on the surface of the skin.
Whether the trigger is allergic or not, a complicated release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood vessels.
Welts may be pinpoint in size, or several inches in diameter.
Angioedema is a related condition (also from allergic and nonallergic causes), though fluid leakage is from much deeper blood vessels in the subcutaneous or submucosal layers. Individual hives that are painful, final more than 24 hours, or leave a bruise as they heal are more likely to be a more serious condition called urticarial vasculitis.
Hives caused by stroking the skin (often linear in appearance) are due to a benign condition called dermatographic urticaria.