Allergic Reactions
An allergic reaction is an immune system response that occurs when the body mistakenly identifies a normally harmless substance (an allergen) as a threat. This overreaction triggers a release of chemicals like histamine, leading to a range of symptoms that can vary from mild discomfort to a severe, life-threatening condition called anaphylaxis.
Common Symptoms
- Hives (urticaria), rash, or intense itching
- Swelling of the face, lips, eyes, or throat (angioedema)
- Difficulty breathing, wheezing, or shortness of breath
- Nausea, vomiting, abdominal cramps, or diarrhea
- Runny nose, sneezing, or itchy/watery eyes
Clinical Sources
- Allergic Reaction: Causes, Symptoms & TreatmentsCleveland Clinic
- Allergies: Types, Symptoms, Treatment & ManagementCleveland Clinic
Diagnostic Lab Tests
Tests commonly used to diagnose or monitor Allergic Reactions:
Eosinophils
Eosinophils are a type of white blood cell primarily involved in the response to parasitic...
Eosinophils (%)
Eosinophils are specialized leukocytes primarily involved in the response to parasitic inf...
Eosinophils
Eosinophils are specialized granulocytes that play a dual role in the immune system: they ...
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