Although migraine is defined by the headache and headache‐associated symptoms, the true beginning of a migraine attack lies in the premonitory phase. To understand the generation of attacks, one needs to investigate the phase before headache starts. The premonitory phase of migraine is characterized by a well‐described complex of symptoms. Its duration, however, is not clearly defined, and there are no biomarkers to help define when this phase starts.

中文翻译：

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超过 30 天的纵向神经影像学：偏头痛的时间特征

虽然偏头痛是由头痛和头痛相关症状来定义的，但偏头痛发作的真正开始在于预兆期。要了解发作的产生，需要调查头痛开始前的阶段。偏头痛的先兆阶段的特点是症状复杂。然而，它的持续时间没有明确定义，也没有生物标志物可以帮助定义这个阶段何时开始。