(1)当上楼梯时,突然痛了起来,并且持续不止。
The pain came on suddenly while walking up the stairs and it was persistent.
疼痛的发生
感觉疼痛 feel (have; suffer from) a pain; pain is felt in ; feel painful
头痛 have a headache; be troubled with a headache; feel a pain in one's head
患剧烈头痛 have a nasty (bad) headache

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