Browse allergies and immunology content in conditions.
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Allergic rhinitis (hay fever) affects 400 million people globally. Triggered by allergens causing IgE-mediated nasal inflammation. Learn about seasonal vs perennial types, antihistamines, corticosteroid nasal sprays, and immunotherapy.
Anaphylaxis is a severe, life-threatening allergic reaction requiring immediate epinephrine. Triggered by foods, insect venom, and medications. Learn to recognize signs, use an EpiPen, and manage long-term prevention.
Asthma is a chronic airway disease affecting 262 million people globally. Inhaled corticosteroids (ICS) are the cornerstone of treatment. Learn about triggers, spirometry diagnosis, bronchodilators, and biologic therapies for severe asthma.
Drug allergy is an immune-mediated adverse reaction to a medication. Penicillin, sulfonamides, and NSAIDs are the most common culprits. Learn about anaphylaxis, skin testing, and desensitization.
Food allergy affects 8% of children and 2-3% of adults globally. Learn about IgE-mediated reactions, the Big Nine allergens, anaphylaxis management, epinephrine auto-injectors, and oral immunotherapy.
Immunodeficiency disorders impair the immune system's ability to fight infections. Primary immunodeficiencies affect 1 in 1,200 people. Learn about causes, diagnosis, immunoglobulin therapy, and when recurrent infections signal immune disease.
Skin allergies affect over 10% of the global population, causing eczema, contact dermatitis, hives, and angioedema. Learn about allergen triggers, patch testing, antihistamines, and topical steroid therapy.
Urticaria (hives) affects 20% of people during their lifetime, causing intensely itchy raised wheals from histamine release. Chronic spontaneous urticaria persists over 6 weeks and responds to second-generation antihistamines or omalizumab.
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