Why do I get cold sores on my period?
Last updated September 3, 2026.
Period cold sores are hormone-triggered HSV-1 reactivation. Treat at the first tingle - antivirals work early, not late - and watch contagion during outbreaks.
What to do
- Treat at the tingle - the early window is where antivirals work, per MedlinePlus.
- Know your high-risk days - period-linked outbreaks are predictable; ask about suppression if frequent.
- Cut contagion - no kissing, no shared lip products, hands washed.
- See a doctor for frequent or near-eye outbreaks - or ones that will not heal.
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