the british medical journal recently published a study revealing that left-handed people may have an increased chance of developing premenopausal breast cancer. more than twice as likely.
why? previous studies have suggested that high levels of sex hormones before birth may cause left-handedness. it’s also thought that hormones can trigger changes in the breast tissue that make tumor growth more likely. all together, you see that left-handed people have twice the risk for breast cancer. interesting.
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