Incoordination or irregular function of blood vessels, causing abnormal blood flow patterns or vascular instability.
From Greek 'angeion' (vessel) + 'ataxia' (disorder, incoordination). Medical term borrowed from neurological terminology to describe vessels that fail to coordinate properly.
This is what happens when your blood vessels lose their 'communication'—instead of constricting and dilating in coordinated waves to move blood efficiently, they spasm randomly, which can cause fainting spells, blood pressure swings, or migraine headaches.
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