Causes of Urticaria
| Acute urticaria | |
|---|---|
| IgE mediated | For example food allergy, drugs, latex |
| Drugs | For example betalactam antibiotics, NSAIDs |
| Infection | |
| Idiopathic | |
| Chronic urticaria | |
| Inducible (physical) urticaria | For example cold, exercise, solar, pressure, delayed vibration, aquagenic |
| Chronic infection | For example H. pylori, cholecystitis, parasitic infestation, hepatitis B and C, dental caries and gingivitis |
| Autoimmune | Antibody directed at FcϵR1α or IgE on mast cells Thyroid autoimmunity (patient usually euthyroid) |
| Stress | |
| Miscellaneous | Urticaria pigmentosa CAPS (cryopyrin-associated autoinflammatory syndrome) Dietary pseudoallergens |
| Spontaneous (idiopathic) |