极大的痛苦用英语怎么说

"Extreme pain" 是极大的痛苦的英文表达。
其中 "extreme" 意为 "极端的"，"极度的"，"非常的"。
而 "pain" 意为 "疼痛"，"痛苦"。
例句：
He is suffering from extreme pain in his back. (他的背部疼痛非常严重。)
The accident caused her to experience extreme pain. (这次事故让她经历了极大的痛苦。)
The cancer had spread to multiple parts of his body, causing him extreme pain. (癌症已经扩散到他的身体的多个部位，导致他极大的痛苦。)