While it is not exactly clear why women with a history of migraines had a lower risk for breast cancer, Li and colleagues suspect hormones are playing a role.
"Women who have higher levels of estrogen in their blood have higher levels of breast cancer," Li said in a telephone interview.
And he said migraines are often triggered by low levels of the hormone estrogen, such as when estrogen levels fall during a woman's menstrual cycle.
Women who get migraines "may have a chronically lower baseline estrogen. That difference could be what is protective against breast cancer," Li said.
By Julie Steenhuysen, Reuters
Article is here
(no subject)
Date: 2008-11-10 02:10 pm (UTC)