Syncope is common in adolescents. It is usually attributable to simple faint, but the differential diagnosis includes other, less common disorders, such as migraine, epilepsy, hyperventilation, hysteria and cardiac dysrhythmia or outflow obstruction. The patient's feelings immediately before and after the syncopal episode will help the physician determine the cause. An observer's description of the event may also be helpful. Laboratory evaluation is seldom necessary.
晕厥在青少年中很常见。它通常归因于单纯性昏厥，但鉴别诊断还包括其他不太常见的疾病，如偏头痛、癫痫、换气过度、癔症以及心律失常或流出道梗阻。晕厥发作前后患者的感受将有助于医生确定病因。观察者对该事件的描述也可能有帮助。很少需要进行实验室检查。
