Vasovagal syncope occurs when the nervous system sends inappropriate signals through the body. Nerves help regulate blood pressure by constricting or dilating the vessels. Typically, the brain receives enough blood from this process, but when the nerves do not deliver the right signals, blood vessels dilate and the heart can slow down. Blood then pools in the legs, causing blood pressure to drop. The brain gets too little blood, and this results in a loss of consciousness.
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