Allergic Reactions and Anaphylaxis
What is Allergic Reactions and Anaphylaxis?
Allergic reactions happen when your immune system overreacts to a harmless substance. Your body treats things like pollen, food, or insect venom as dangerous invaders. This triggers the release of chemicals like histamine that cause uncomfortable or even dangerous symptoms.
Most allergic reactions are mild and cause itching, sneezing, or hives. Anaphylaxis is a severe, life-threatening allergic reaction that affects multiple body systems at once. It can happen within seconds or minutes of exposure to an allergen. Anaphylaxis requires immediate emergency treatment with epinephrine, also known as an EpiPen.
More than 50 million Americans experience allergies each year. Anaphylaxis sends someone to the emergency room every 6 minutes in the United States. Understanding your immune system patterns helps you identify triggers and prevent future reactions.
Symptoms
Mild to moderate allergic reaction symptoms include:
- Skin rash, hives, or itching
- Sneezing, runny nose, or watery eyes
- Swelling of the lips, tongue, or face
- Nausea, vomiting, or stomach cramps
- Tingling in the mouth or throat
Anaphylaxis symptoms are severe and may include:
- Difficulty breathing or wheezing
- Rapid or weak pulse
- Dizziness or fainting
- Severe drop in blood pressure
- Tightness in the throat or trouble swallowing
- Loss of consciousness
Some people experience mild symptoms before a severe reaction develops. Others have no warning signs before anaphylaxis begins. Always take early symptoms seriously if you have a history of severe allergies.
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Causes and risk factors
Allergic reactions occur when your immune system identifies a normally harmless substance as a threat. Common allergens include foods like peanuts, tree nuts, shellfish, milk, and eggs. Insect stings from bees, wasps, and fire ants can trigger severe reactions. Medications like penicillin, aspirin, and certain antibiotics also cause allergies in some people. Latex and environmental allergens like pollen or pet dander can cause reactions too.
Risk factors for developing allergies include family history of allergic conditions like asthma or eczema. Having one type of allergy increases your risk of developing others. Children are more likely to have food allergies, though many outgrow them by adulthood. People with asthma face higher risk of severe anaphylaxis. Previous mild reactions can sometimes progress to severe reactions with future exposures.
How it's diagnosed
Doctors diagnose allergies through your medical history, physical exam, and testing. Blood tests can show patterns in your white blood cells that suggest allergic activity. Eosinophils are a type of white blood cell that often increases during allergic conditions. Elevated eosinophils within your total white blood cell count can indicate ongoing allergic responses in your body.
Rite Aid offers blood testing that measures your white blood cell count and related immune markers. This helps track your immune system patterns over time. Skin prick tests and specific IgE antibody tests can identify particular allergens. Your doctor may also recommend elimination diets or challenge tests for food allergies. Monitoring your blood work regularly helps you and your doctor understand your immune health.
Treatment options
- Avoid known allergens once identified through testing
- Carry an epinephrine auto-injector if you have severe allergies
- Take antihistamines like diphenhydramine for mild reactions
- Use corticosteroids to reduce inflammation after reactions
- Consider immunotherapy, also called allergy shots, for long-term desensitization
- Eat an anti-inflammatory diet rich in omega-3 fatty acids and quercetin
- Support gut health with probiotics and fermented foods
- Reduce stress through meditation, yoga, or deep breathing exercises
- Keep a symptom diary to identify patterns and triggers
- Call 911 immediately if you experience signs of anaphylaxis
Concerned about Allergic Reactions and Anaphylaxis? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
An allergic reaction is your immune system's response to an allergen, causing symptoms like hives, itching, or sneezing. Anaphylaxis is a severe, life-threatening allergic reaction that affects multiple body systems at once. Anaphylaxis requires immediate emergency treatment with epinephrine. It can cause difficulty breathing, rapid pulse, loss of consciousness, and severe drops in blood pressure.
Yes, blood tests can reveal patterns that suggest allergic activity in your body. White blood cell counts, particularly eosinophils, often increase during allergic conditions. Specific IgE antibody tests can identify which substances trigger your allergies. Regular blood testing helps track your immune system patterns over time and monitor your response to treatment.
Foods cause about 40% of anaphylaxis cases, especially peanuts, tree nuts, shellfish, and eggs. Insect stings from bees, wasps, and fire ants are another major cause. Medications like penicillin and other antibiotics can trigger severe reactions. In some cases, exercise or unknown triggers cause anaphylaxis.
Anaphylaxis typically begins within 5 to 30 minutes of exposure to an allergen. Some reactions happen within seconds. Rarely, anaphylaxis can develop 1 to 2 hours after exposure. Biphasic reactions can occur where symptoms return 4 to 12 hours after the initial reaction, even after successful treatment.
Some children outgrow food allergies like milk, egg, wheat, and soy by adolescence. However, allergies to peanuts, tree nuts, fish, and shellfish usually last a lifetime. Adults rarely outgrow allergies that developed in adulthood. Regular testing with an allergist can determine if your child has outgrown specific food allergies.
Call 911 immediately if you suspect anaphylaxis. Give epinephrine right away using an auto-injector if available. Have the person lie down with legs elevated unless they are vomiting or having trouble breathing. Stay with them until emergency services arrive, and give a second dose of epinephrine after 5 to 15 minutes if symptoms do not improve.
Most people with allergies benefit from blood testing every 6 months to monitor immune system patterns. Rite Aid offers testing twice per year to track white blood cell counts and eosinophil levels. More frequent testing may be needed if you are starting new treatments or experiencing frequent reactions. Talk to your doctor about the right testing schedule for your situation.
Yes, stress can worsen allergic reactions and lower your threshold for anaphylaxis. Stress hormones affect immune system function and inflammation levels. People often experience more severe allergy symptoms during high-stress periods. Managing stress through meditation, exercise, and adequate sleep may help reduce allergy severity.
Anti-inflammatory foods like fatty fish, berries, and leafy greens may help calm immune overreactions. Quercetin, found in apples and onions, acts as a natural antihistamine. Probiotics support gut health, which is closely linked to immune function. However, these approaches complement but never replace emergency medications like epinephrine for severe allergies.
Yes, adults can develop new allergies at any age, even to substances they have been exposed to for years. Environmental changes, hormonal shifts, or changes in gut health may trigger new allergies. Shellfish allergies commonly develop in adulthood. If you experience new allergic symptoms, get tested to identify triggers and develop a treatment plan.