Women who work the night shift more than twice a week might be increasing their risk for breast cancer, Danish researchers find.
Moreover, the risk appears to be cumulative and highest among women who describe themselves as "morning" people rather than "evening" people, the researchers say.
"About 10 to 20 percent of women in modern societies have night shift work," said lead researcher Johnni Hansen. "It might therefore be one of the largest occupational problems related to cancer."
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