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Credit: Aimee Herring

How to prevent: Cold temperatures, wind, and excessive combing can create a buildup of negative ions on the hair shafts, which causes individual strands to repel one another, explains Roberta J. Hawk, a dermatologist in Billings, Montana. In a word: static. “Use a mild shampoo for dry hair, and always use conditioner, which gets rid of negative ions,” she says. Try Redken Frizz Dismiss Sulfate-Free Shampoo ($19) and Conditioner ($20, ulta.com).
 
How to treat: River Lloyd, a hairstylist at the Peter Coppola Salon in New York City, suggests spraying Static Guard onto a hairbrush and brushing it through hair. “It always works,” he says.
 
When to see a professional: Flyaway hair accompanied by an itchy, flaky scalp indicates dandruff. If the condition doesn’t improve after you use an anti-dandruff shampoo like Head & Shoulders Classic Clean Shampoo ($11, target.com) and Conditioner ($15, amazon.com) for two weeks, see a dermatologist.