Frequent night shifts linked to increased breast cancer risk

Working night shifts more than twice a week is associated with an increased risk of breast cancer, a long term study has found.

Frequent night shifts for several years may disrupt circadian rhythms and normal sleep patterns, curbing the production of the cancer-protecting hormone melatonin.

Lack of sunlight has also been linked to the development of various cancers.

Read more at Institute of Cancer Epidemiology, Danish Cancer Society