I've come down with a fever and need to rest at home; I'll leave by [time].
Short notice
A fever at Short Notice: What to Tell Your Boss
When a fever comes up with little warning, a calm, specific message about cover matters more than a long apology.
Say what you need, briefly
A fever leaves you unfit to work and often contagious. Say you've come down with a fever and need to rest; no thermometer reading required.
Handle short notice well
At short notice, acknowledge the timing briefly, state clearly what you'll leave and when, and name who covers anything urgent. Being specific about cover reassures your manager far more than an apology does.
Example messages
I'm running a fever and would rather not risk passing it on. I'll head out by [time].
Feverish and can't focus — I'll log off by [time] and catch up once I'm back on my feet.
Mistakes to avoid
Don't over-apologise for the timing or leave cover vague. State the plan clearly and keep it short.
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This page shares wording ideas, not legal or HR advice. Follow your own employer's time-off policy.
Common questions
Do I have to give my temperature?
No. A fever and needing to rest is a complete reason.
How do I handle the short notice?
Acknowledge it briefly, be specific about what you'll leave and who covers, then move on.