It's not clear why stress and exhaustion can cause dandruff, but it may have something to do with the body's production of the hormone cortisol. "When this hormone is elevated, the body is more susceptible to illness and rashes, including inflammatory conditions like acne, psoriasis, and seborrheic dermatitis," says Krant. So try to relax and aim for 8 hours of sleep.
Credit: Monica Rodriguez / Getty Images
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