Anaphylaxis
Body System: Immune System | Area Affected: Immune pathways, mast cells, and allergic response mechanisms
Doctor to Consult: Allergist or Immunologist
What It Is
Anaphylaxis: Anaphylaxis is a serious, potentially fatal allergic reaction that can progress rapidly. It typically causes more than one of the following: an itchy rash, throat closing due to swelling that can obstruct or stop breathing; severe tongue swelling that can also interfere with or stop breathing; shortness of breath, vomiting, lightheadedness, loss of consciousness, low blood pressure, and medical shock.
Why It Happens
Anaphylaxis arises due to factors affecting the Immune System. Immune and allergic conditions result from the immune system overreacting to harmless substances or failing to properly distinguish self from non-self. While individual cases vary, a combination of genetic susceptibility, lifestyle factors, and environmental exposures typically contribute to the development of Anaphylaxis.
Who Gets It / Risk Factors
Who Is at Risk for Anaphylaxis
Allergies and food sensitivities are common in children, with some resolving by adulthood. Severe reactions can affect any age group.
A family history of immune system conditions may increase susceptibility to Anaphylaxis.
Contributing Factors
Family history of atopy, prior allergic reactions, asthma, eczema, and exposure to common allergens (food, pollen, medication).
Co-existing health conditions such as asthma, eczema, or other allergic conditions may compound the risk.
When to Seek Emergency Care
Anaphylaxis symptoms (throat swelling, breathing difficulty, rapid pulse, loss of consciousness) associated with Anaphylaxis.
Sudden or rapidly worsening symptoms that impair basic daily function.
Difficulty breathing, severe pain, loss of consciousness, or high fever with confusion.
Medical Overview
A professional summary of diagnosis, treatment, and prevention.
Allergic reactions ranging from mild (hives, itching) to severe (swelling, anaphylaxis) triggered by exposure related to Anaphylaxis.
Respiratory symptoms, gastrointestinal upset, or skin reactions after allergen exposure associated with Anaphylaxis.
Changes in daily functioning or comfort levels that persist beyond a few days.
Scientific References
This content is based on established clinical guidelines and public health resources from the following authoritative sources.
Medically Reviewed for Accuracy
Medical Advisory Board
•Last reviewed: March 20, 2026Content is aligned with established clinical guidelines from authoritative medical institutions, including MedlinePlus (U.S. National Library of Medicine), the CDC, the NIH, and the NHS. All content is reviewed by our medical advisory board for accuracy and safety.