BLOOMINGTON, Minn. -- Hazards of painting, firefighting also examined by international research committee A study by the World Health Organization has found that night shift work increases the risk of cancer in humans. The study found that after prolonged exposure to night shift work, women are at a higher risk to develop breast and colon cancer. Men who work the night shift are more likely to experience prostate cancer. "Shift work that interferes with regular nighttime sleep disrupts circadian rhythms, our body's natural clock," said Dr.



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