backache

Sitting in an unergonomic office chair for eight hours a day can cause chronic backache.

(Chinese) 每天在不符合人体工程学的办公椅上坐八小时会导致慢性背痛。

He applied a heated patch to his lower spine to relieve the severe backache from lifting heavy boxes.

(Chinese) 他在下脊柱贴了一个发热贴，以缓解因搬运重箱子引起的严重背痛。