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).
For some women, migraine attacks occur during periods, or just before periods. The cause or trigger is thought to be the fall of the level of oestrogen. The blood level of this chemical (hormone) falls just before a period. It is not a low level of oestrogen that is thought to be the trigger.