Type | Subtype | Cause |
---|---|---|
Spontaneous urticaria | ||
 | Acute urticaria |  |
 | Chronic urticaria | Infections (bacterial, viral, parasitic, fungal) |
 |  | Food and additives |
 |  | Drugs (e.g. NSAIDs; ACE) |
 |  | Emotional stress |
 |  | Autoimmune disorders |
Inducible urticaria | ||
Physical | Dermographism | Mechanical shearing force (rubbing or scratching) |
Cold urticaria | Cold air; cold liquid; or cold solid | |
Delayed pressure urticaria | Vertical pressure | |
Heat urticaria | Local heat exposure | |
Solar urticaria | Ultraviolet or visible light | |
Vibratory angioedema | Vibratory forces | |
Other types | Aquagenic urticaria | Water; sweat; lacrimation |
Cholinergic urticaria | Increasing core body temperature (e.g. exercise; fever) | |
Contact urticaria | Contact (e.g. foods; plant components; latex; drugs, cosmetics; textiles) |