Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Beauty parlour syndrome (BPS), sometimes referred to as Vertebrobasilar insufficiency, is when the neck is overextended back into a sink during hairwashing, damaging the blood vessels in the neck and disrupting the blood flow to the brain, resulting in a potential stroke. Though uncommon and thought to affect only people with already weakened neck arteries, the syndrome has been at the centre of a debate in several recent stroke deaths.BPS was first reported in the early 1990s when an American neurologist identified five patients who suffered strokes as a result of prolonged distortion of their necks from sitting at salon wash basins.