More than two million Americans work third shift, according to the Bureau of Labor estimates. It's the kind of schedule linked to a number of health issues, but a new study may have doctors rethinking a commonly accepted link between odd working hours and breast cancer.
United Kingdom's Oxford University researchers evaluated 800,000 women, who participated in several large studies in the past, to see whether working the night shift increased their breast cancer risk.
When researchers looked at the roughly one in a thousand women who developed breast cancer, they found that women working nights appeared to have no higher risk than those who did not.
This study alone is unlikely to completely disprove a possible link.
