What can trigger a cold sore?

Last updated on September 30, 2020

A cold sore can be triggered by many different factors, including

  • Hormonal changes during menstruation or pregnancy
  • Sunburn
  • Extreme temperatures (hot or cold)
  • Stress (physical or emotional)
  • Fatigue
  • Fever and illness, such as cold or flu
  • Damaged, dry or cracked lips

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