Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The revised classification of urticaria divides chronic urticaria into chronic spontaneous urticaria (CSU), with no external trigger, and chronic inducible urticaria (CINDU), with an identifiable trigger. Acute urticaria remains as that which lasts less than 6 weeks.
