What Is an Allergic Reaction?
An allergic reaction occurs when the immune system mistakenly identifies a normally harmless substance as a threat and releases chemicals, such as histamine, to defend the body. These reactions can range from mild symptoms like itching or sneezing to severe, life-threatening emergencies such as anaphylaxis.
Common allergens include foods, medications, insect stings, latex, and environmental substances like pollen or pet dander.
Why Allergic Reactions Matter
While many allergic reactions are mild, some can progress rapidly and affect breathing, blood pressure, or multiple organ systems. Prompt recognition and treatment are essential to reduce the risk of serious complications.
Common Causes of Allergic Reactions
- Foods such as peanuts, tree nuts, shellfish, milk, and eggs
- Prescription and over-the-counter medications
- Insect stings and bites
- Latex
- Pollen
- Dust mites
- Pet dander
- Mold
Signs and Symptoms of an Allergic Reaction
- Hives
- Itching
- Skin rash
- Swelling of the face, lips, or tongue
- Sneezing
- Runny nose
- Watery eyes
- Wheezing
- Shortness of breath
- Nausea or vomiting
- Dizziness
- Anaphylaxis in severe cases
How Is an Allergic Reaction Treated?
Treatment depends on the severity of the reaction. Mild reactions may improve with antihistamines or other medications recommended by a healthcare provider. Severe allergic reactions require immediate emergency treatment, including epinephrine when prescribed, followed by emergency medical care.
How Home Care Can Help
Home care professionals help individuals with allergies by recognizing early symptoms, encouraging avoidance of known allergens, supporting medication adherence, monitoring for changes in health, and educating families about emergency response plans. Skilled nurses can also reinforce proper use of prescribed emergency medications.
Home Care Tip
If you have a history of severe allergic reactions, always carry your prescribed epinephrine auto-injector and ensure family members and caregivers know when and how to use it.
Frequently Asked Questions About Allergic Reactions
Can allergic reactions worsen over time?
Yes. The severity of allergic reactions can vary, and some individuals may experience more serious reactions with future exposures.
What is anaphylaxis?
Anaphylaxis is a severe, life-threatening allergic reaction that requires immediate treatment with epinephrine and emergency medical care.
Can allergies develop later in life?
Yes. Although many allergies begin during childhood, new allergies can develop at any age.
When to Seek Emergency Medical Care
Call emergency medical services immediately if an allergic reaction causes difficulty breathing, swelling of the throat or tongue, severe dizziness, fainting, or symptoms of anaphylaxis.