Cerebrovascular disease
From Expert System: Fainting (Syncope)
Transient ischemic attacks ("TIA") and strokes (persistent loss of neurological function) are caused by partial or complete obstruction of arteries that supply blood to the brain. The acute onset of a TIA or stroke in any part of the brain may be associated with altered consciousness, and rarely loss of consciousness that may simulate fainting. Obstruction of arteries supplying blood to the brain stem may produce episodic loss of consciousness resembling fainting, but usually associated with neurological symptoms involving vision, balance, or motor control. Loss of consciousness per se must be distinguished from true syncope.
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