April 14, 2021
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- Family Medicine
- Wellness Institute
July 5, 2017 • Allergy and Immunology
Allergic reactions can span a wide range of possible symptoms and outcomes, and they’re very common—as many as 30 percent of US adults and 40 percent of children have some kind of allergy.
Here are the basics of allergic reactions and how to recognize moderate or serious reactions.
The immune system is designed to defend the body from things like bacteria and viruses, but it doesn’t always attack the right sources. Certain foods or pollens are examples of allergens, or items that can trigger the immune system to release antibodies. These antibodies tell cells to block that substance, which causes the cells to send out histamine—this causes blood vessels to expand, and histamine, with the help of other chemicals, trigger allergy symptoms.
Antibodies target only one type of allergen, which is why many people just have a single major allergy and not several. You can become in contact with allergens through the skin, eyes, nose, mouth or stomach. In many cases, first-time exposure to a substance may only produce a mild reaction, but repeated exposures may lead to more serious reactions.
Family history can be important in the formation of allergies, and common allergens that cause allergies can include:
Symptoms of allergic reactions can range from mild to extreme or even life-threatening, all depending on how the body reacts and how much of the allergen is in your system. Symptoms generally depend on the type of allergen or reaction:
Severe cases of allergic reactions can lead to anaphylaxis, a serious situation that puts the body into shock and leads to life-threatening complications. The most likely causes of anaphylaxis are food, medications, insect bites or contact with latex. In some cases, a second anaphylactic episode will take place up to 12 hours after the first.
Symptoms of anaphylaxis may include:
If you have a history or high risk of anaphylaxis, your doctor might prescribe medicine you can give yourself, or be given by someone else. These are devices called epipens that you carry with you at all times in cases of a serious reaction. Even if you’ve used this device, always call 911 and go right to the emergency room after an anaphylactic reaction.
If you’re dealing with allergic reactions ranging from mild to severe, your doctor can provide recommendations for proper safety and symptom reduction.
“What Is an Allergic Reaction?” WebMD. http://www.webmd.com/allergies/allergic-reaction-causes#1
“Allergic reactions.” MedlinePlus. https://medlineplus.gov/ency/article/000005.htm
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This information is not intended to replace the advice of a medical professional. You should always consult your doctor before making decisions about your health.