Symptom: Allergic Reaction

An allergic reaction is the body's way of responding to an "invader." When the body senses a foreign substance, called an antigen, the immune system is triggered. The immune system normally protects the body from harmful agents such as bacteria and toxins. Its overreaction to a harmless substance (an allergen) is called a hypersensitivity reaction, or an allergic reaction.
  • Anything can be an allergen. Dust, pollen, plants, medications (such as ibuprofen, sulfa drugs such as sulfamethoxazole and trimethoprim [Bactrim], codeine, amoxicillin [Amoxil, Amoxil Pediatric Drops, Moxatag, Trimox], cephalexin [Keflex]), foods (common food allergies include shrimp and other shellfish, peanuts), insect bites (such as mosquito bites or bee stings), animal dander, viruses, or bacteria are examples of allergens.
  • Reactions may occur in one spot, such as a small localized skin rash, itchy eyes, face bumps, or all over, as in a whole body rash such as hives (urticaria).
  • A reaction may include one or several symptoms.
  • Most allergic reactions are minor, such as a rash from poison ivy, mosquito or other bug bites, or sneezing from hay fever. The type of reaction depends on the person's immune system response, which is sometimes unpredictable.In rare cases, an allergic reaction can be life-threatening (known as anaphylaxis). The Asthma and Allergy Foundation of America (AAFA) estimates that at least one in 50 Americans (1.6%), and as many as one in 20 (5.1%) have had anaphylaxis occur, resulting in an average of 186 to 225 deaths per year.Allergies are very common. The AAFA states that allergies affect 50 million Americans, are the fifth leading chronic disease in the U.S., and the third leading chronic disease among children under age 18. More than 40 million people have indoor/outdoor allergies as their primary allergy. More than 17 million people visit their doctor for allergies annually, and food allergies account for 50,000 visits to the emergency room annually.

    Source: http://www.emedicinehealth.com

    An allergic reaction is the body's way of responding to an "invader." When the body senses a foreign substance, called an antigen, the immune system is triggered. The immune system normally protects the body from harmful agents such as bacteria and toxins. Its overreaction to a harmless substance (an allergen) is called a hypersensitivity reaction, or an allergic reaction.
    • Anything can be an allergen. Dust, pollen, plants, medications (such as ibuprofen, sulfa drugs such as sulfamethoxazole and trimethoprim [Bactrim], codeine, amoxicillin [Amoxil, Amoxil Pediatric Drops, Moxatag, Trimox], cephalexin [Keflex]), foods (common food allergies include shrimp and other shellfish, peanuts), insect bites (such as mosquito bites or bee stings), animal dander, viruses, or bacteria are examples of allergens.
    • Reactions may occur in one spot, such as a small localized skin rash, itchy eyes, face bumps, or all over, as in a whole body rash such as hives (urticaria).
    • A reaction may include one or several symptoms.
    Most allergic reactions are minor, such as a rash from poison ivy, mosquito or other bug bites, or sneezing from hay fever. The type of reaction depends on the person's immune system response, which is sometimes unpredictable.In rare cases, an allergic reaction can be life-threatening (known as anaphylaxis). The Asthma and Allergy Foundation of America (AAFA) estimates that at least one in 50 Americans (1.6%), and as many as one in 20 (5.1%) have had anaphylaxis occur, resulting in an average of 186 to 225 deaths per year.Allergies are very common. The AAFA states that allergies affect 50 million Americans, are the fifth leading chronic disease in the U.S., and the third leading chronic disease among children under age 18. More than 40 million people have indoor/outdoor allergies as their primary allergy. More than 17 million people visit their doctor for allergies annually, and food allergies account for 50,000 visits to the emergency room annually.

    Source: http://www.emedicinehealth.com

    1 23...Next»(Page 1 of 14)GlossaryAllergic Reaction Topic Guide YOU MAY ALSO LIKE VIEW What Happens in a Nasal Allergy Attack Must Read Articles Related to Allergic Reaction Allergy Shots Some allergens are simply impossible to avoid. You cannot live a normal life and completely avoid pollen, dust mites, mold spores, and certain other common trig...learn more >> Allergy: Insect Sting Several insects belonging to the class Hymenoptera are capable of injecting venom into humans and animals. These insects include honeybees, bumble bees, hornets...learn more >> Allergy: Poison Ivy, Oak, and Sumac Poison ivy, poison oak, and poison sumac can causes an allergic reaction when someone comes in contact with the plant. This oil is called urushiol. The resultin...learn more >> See the Entire Allergic Reaction Topic Guide » Patient Comments & Reviews The eMedicineHealth doctors ask about Allergic Reaction: Allergic Reaction - Symptoms What were the symptoms and signs of your allergic reaction? View 32 Comments Share Your Story Allergic Reaction - Treatment What was the treatment for your allergic reaction? View 6 Comments Share Your Story Allergic Reaction - Experience Please describe your experience with an allergic reaction. View 1 Comment Share Your Story Allergic Reaction - Home Remedies Have any home remedies been effective for your allergic reaction(s)? 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    Read What Your Physician is Reading on Medscape Hypersensitivity Reactions, Immediate »The immune system is an integral part of human protection against disease, but the normally protective immune mechanisms can sometimes cause detrimental reactions in the host. Read More on Medscape Reference »
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    Signs and Symptoms

    Welcome to WebHealthNetwork an online symptom search and symptom directory. Here you can find what is the symptom Allergic Reaction and what does it mean, you can also check what illnesses and diseases this symptom relates to.