当大脑附近的炎症触发三叉神经伤害感受器(对面部疼痛作出反应的细胞)来传递化学信号时，偏头痛就发作了。

Migraines occur when inflammation around the brain triggers trigeminal nociceptors-cells responsible for pain sensations around the face-to transmit chemical signals.

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由于它在伤害感受器和肌肉收缩的效应，肉毒素在预防慢性每日头痛或紧张型头痛方面有很大的吸引力。

Given its effects on nociception and muscle contraction, botulinum appears to be an attractive agent in the prophylaxis against chronic daily headache or tension-type headache.

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