From: Insights and advances in chronic urticaria: a Canadian perspective
Acute urticaria | Chronic urticaria | |
---|---|---|
Characteristics | Persists for less than 6 weeks | Chronic spontaneous urticaria |
Persists for at least 6 weeks | ||
Inducible urticaria | ||
Occurs in response to an identifiable (physical) trigger. | ||
Subtypes include: | ||
● Physical urticaria (dermographism, cold urticaria, delayed pressure urticaria, solar urticaria, heat urticaria, vibratory angioedema) | ||
● Cholinergic urticaria | ||
● Contact urticaria | ||
● Aquagenic urticaria |