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Article:

Calling in Sick: 7 Good Reasons, 7 Lame Reasons

The Believable and Not-So-Believable Reasons to Take a Sick Day

Good reason 2: You need a mental health day

If you are feeling blah and burnt out, and feel like you need a day off to recharge your batteries, schedule a mental health day in advance so you don't leave co-workers in the lurch.

If a spur-of-the moment mental health day is necessary, it's okay to use sickness as an excuse. Just remember to keep your reason simple, don't go into detail, and choose an illness that is quickly resolved -- like migraine or stomach bug.