What causes chronic urticaria?

Updated: Mar 21, 2018
  • Author: Henry K Wong, MD, PhD; Chief Editor: Michael A Kaliner, MD  more...
  • Print

In chronic urticaria, which persists for longer than 6 weeks, a cause is difficult to identify, despite perhaps even exhaustive efforts. This is known as chronic idiopathic urticaria, [2] although most of these cases are chronic autoimmune urticaria, as defined by a positive RAST result. [9, 38]

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!