Researchers say artificial light could work by blocking a hormone that helps stave off the disease.
A new research has pointed out that living close to street light could increase a woman’s risk of breast cancer. Scientists associated with the study have even gone on to say that women who work under artificial lights, like night shift workers are even more at risk of developing the disease.
Researchers believe that artificial light upsets a woman's normal circadian rhythm (body clock) which can disrupt the natural biological processes in her body.
It was also found to block a protective hormone that helps stave off the disease.
Experts from Harvard Medical School found that as exposure to artificial light increased so did the rate of breast cancer. However, the link was found only among premenopausal women who were smokers at present or in the past.
According to Professor Peter James the results suggested that the widespread exposure to outdoor lights during night caould represent a novel risk factor for breast cancer.
Women with less melatonin, such as those who work the night shift or sleep fewer hours, have been found to have a higher risk of breast cancer.
The study was published in the journal Environmental Health Perspectives.