What are the physical triggers of chronic urticaria?

Updated: Jul 31, 2018
  • Author: Marla N Diakow, MD; Chief Editor: William D James, MD  more...
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In approximately 20% of cases, physical factors can be identified as a consistent cause or trigger for chronic urticaria. The various types of physical urticaria are diagnosed by challenge testing. Several types exist, and it is not uncommon to find that a single patient has more than one type. The following are some of the types of physical urticaria, along with their triggers:

  • Dermatographism (dermographism) - Firm stroking

  • Delayed pressure urticaria - Pressure

  • Cold urticaria - Cold

  • Aquagenic urticaria - Water exposure

  • Cholinergic urticaria - Heat, exercise, or stress

  • Solar urticaria - Sun exposure (visible light and/or UV)

  • Vibratory urticaria - Vibration

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