Working night shifts long-term may increase breast cancer risk

Women who work night shifts for 30 years or more are twice as likely to develop breast cancer compared to other women, a new study has found.

The findings could apply to nurses, cleaners, care workers, call centre handlers and some shop workers who work unusual hours for the course of their careers.

Canadian researchers looked at 1,134 women with breast cancer and 1,179 women of the same ages without the disease.

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