Table 1 Classification of Urticaria Subtypes (Presenting With Wheals and/or Angioedema) Based on the Different Eliciting Stimuli
From: Diagnosis and Treatment of Urticaria and Angioedema: A Worldwide Perspective
Types | Subtypes | Definition |
|---|---|---|
Spontaneous urticaria | Acute spontaneous urticaria | Spontaneous wheals and/or angioedema < 6 wk |
| Â | Chronic spontaneous urticaria | Spontaneous wheals and/or angioedema > 6 wk |
Urticarias induced by physical agents | Cold contact urticaria | Eliciting factor: cold objects/air/fluids/wind |
| Â | Delayed pressure urticaria | Eliciting factor: vertical pressure (wheals arising with a 3-12 h latency) |
| Â | Heat contact urticaria | Eliciting factor: localized heat |
| Â | Solar urticaria | Eliciting factor: UV and/or visible light |
| Â | Urticaria factitia/dermographic urticaria | Eliciting factor: mechanical shearing forces (wheals arising after 1-5 min) |
| Â | Vibratory urticaria/angioedema | Eliciting factor: vibratory forces, e.g. pneumatic hammer |
Other inducible urticarias | Aquagenic urticaria | Eliciting factor: water |
| Â | Cholinergic urticaria | Elicitation by increase of body core temperature due to physical exercises, spicy food |
| Â | Contact urticaria | Elicitation by contact with urticariogenic substance |
| Â | Exercise-induced anaphylaxis/urticaria | Eliciting factor: physical exercise |