It is chronic back or leg pain that happens after back surgery.

这是慢性背部或腿部疼痛，背部手术后发生的。

youdao

Chronic back pain occurs when back pain lasts for 3 or more months.

慢性背痛时发生腰痛3个月或以上持续。

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The extra stress puts pressure on your spinal disks and can eventually lead to chronic back pain.

脊椎间盘上增加的压力会导致慢性背部疼痛。

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Many different diseases, conditions and injuries can cause chronic pain, from back problems to burns.

VOA: special.2010.05.04

By the way, if we go back to this, another big part of disease--chronic disease that's related to diet, is the physical activity part of the equation.

顺便一说 我们回过去看,大多数疾病,与饮食有关的慢性疾病,与一个关于肢体运动的方程式有关

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Many different diseases,conditions and injuries can cause chronic pain, from back problems to burns.

VOA: special.2009.02.10

He said people with chronic back pain tended to move in automatic ways that perpetuate the pain.

BBC: NEWS | Health | Pain link to permanent brain loss

President Kennedy left behind an upholstered rocking chair that he used to alleviate his chronic back pain.

WSJ: In the City's Power Suite

The bullet went through his stomach and left him with weakened muscles on his right side and chronic back pain.

NPR: Wounded Soldier Fights for Health Benefits