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What causes shoulder pain? 什么原因导致了肩痛？ Shoulder pain is a common ache in the U.S.: By some estimates, as many as 67% of people experience shoulder discomfort at some point over the course of their lives. The most mobile joint in your body, the shoulder is made up of bones held in place by muscles, tendons, and ligaments. They're all designed to work together to allow the shoulder to move freely in many different directions. This allows you to do everything from raising your arms over your head to throwing a baseball and scratching your back. "Unfortunately, this mobility comes at the expense of stability," and that leaves the shoulder vulnerable to injury, says Clifford Stark, medical director of Sports Medicine at Chelsea in New York City. Factor in the wear and tear of everyday life and it's easy to see why you're shouldering so much pain. 在美国，肩痛是常见的症状。据估计，多达67%的人会在一生中的某个时刻肩痛。肩膀是人体最活跃的关节，由骨头、肌肉、肌腱和韧带组成。这些成分注定要一起运作，这样肩膀才能在各个方向上自由移动。因此你能抬手越过头顶扔棒球、还能挠背。"不幸的是，这种移动是以稳定为代价的，"导致肩膀很容易受伤，纽约市切尔西运动医学的医疗总监克利福德·斯塔克说道。日常生活中，磨损肩膀的因素很多，因此你的肩膀为什么这么痛也就不言自明了。 | 
