label: Postural Orthostatic Tachycardia Syndrome
label_lc: postural orthostatic tachycardia syndrome
description: A syndrome characterized by orthostatic intolerance resulting in tachycardia, often accompanied by a decrease in the blood pressure. It occurs when individuals change from the supine position to an upright position. Other signs and symptoms include lightheadedness, fainting, fatigue and muscle weakness.