The biochemical named Histamine is one of the foremost reason for the occurrence of Urticaria.

The triggering factors include-

  • Foods - Peanuts, eggs, fish and milk
  • Medications – Penicillin, aspirin and blood pressure controlling medications
  • Insect bites
  • Environmental factors – Sunlight, heat and cold water
  • Emotional stress
  • Certain medical illness – Thyroid, Hepatitis and HIV
  • Genetics