causing or capable of causing death; mortal; deadly: a fatal accident; a fatal dose of poison. causing destruction, misfortune, ruin, or failure: The withdrawal of funds was fatal to the project. decisively important; fateful: The fatal day finally arrived.
Extreme cold spells may come. Submitted by Erika (not verified) on Mon, 2009-09-28 13:40. Extreme cold spells may come from bad circulation (the blood not flowing properly) or from the thyroid (low thyroid function leads to a lower body temperature).
The exact cause of migraines is unknown. Changes in blood flow to different regions of the brain are associated with migraines and may be responsible for triggering their onset. Further specific triggers, such as estrogen, are likely, given the much higher incidence of migraines in postpubertal and premenopausal woman.