Since it is a rare disorder, it is difficult to say what the premonitory symptoms are.

由于这是一种罕见的病症，我们很难说清楚它的初期症状。

youdao

Objective to investigate the relationship between progestin and premonitory abortion in early stage.

目的探讨孕酮水平与早期先兆流产关系。

youdao

Some patients develop premonitory signs and symptoms, such as nervousness, sweating, and tachycardia.

病人可有先兆性症状，例如易于激动，出汗和心动过速。

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Dr. Goadsby and colleagues at UCSF are conducting more imaging studies to determine what brain activity occurs during the premonitory phase.

WSJ: Stopping a Migraine Before It Starts

It could be that physiological changes in the premonitory phase trigger a sensitivity to such foods, rather than the other way around.

WSJ: Stopping a Migraine Before It Starts

Experts also think that they can learn a lot about the origin of migraines by studying how the body changes in the premonitory phase.

WSJ: Stopping a Migraine Before It Starts