“一阵一阵痛”可以翻译为“come in waves of pain” 或者 “experience waves of pain” ，也可以说 “have pain that comes and goes in waves” 。
例如：
The headache comes in waves of pain.（头疼一阵一阵地痛。）
She's been experiencing waves of pain in her abdomen.（她腹部一阵一阵地疼 。）