Why do I get canker sores when stressed?
Last updated September 3, 2026.
Because canker sores are immune-mediated and stress is a recognized trigger: in genetically susceptible people (up to 46% have family history), a T-cell-driven attack on the mouth's soft lining produces the ulcer - and StatPearls lists stress alongside trauma and iron, folate, B12, and zinc deficiency as linked factors. The mechanism is not fully mapped, but the stress-sore pattern is consistent enough to be clinical consensus. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What to do
- Treat with real medicine: topical corticosteroid paste is first-line - ask a clinician.
- Comfort basics: salt-water rinses, and skip acidic or abrasive foods during a flare.
- Expect 1 to 2 weeks: that is the normal healing window.
- Get seen if: sores last past 3 weeks, recur constantly, or come with genital ulcers or eye inflammation - that pattern earns a deficiency and systemic-disease workup.
Related questions
- How long does a cold sore last?
- Why does my jaw click?
- What does it mean if my gums bleed?
- Why is my tongue white?