pain 
英 [peɪn]  美 [peɪn] 
n. 疼痛；痛苦

v. 使痛苦；引起疼痛，感到疼痛

例句：
She complained of severe pains in her chest. 

她自诉胸口剧痛。

To help ease the pain, heat can be applied to the area. 

对疼痛的部位进行热敷有助于缓解疼痛。

I felt a sharp pain in my lower back. 

我感觉后背下部一阵剧痛。

She phoned the doctor because she had a pain in her chest. 

因为胸口疼，她给医生打了电话。

She's in a lot of pain. 

她感到很疼。