Generally speaking, modern people don't exercise enough, and their shoulder and neck muscles tend to be weak and unable to support the weight of their bones. As a result there is excessive pressure on the joints between the cervical vertebrae, causing pain.
一般來說，現代人普遍缺乏運動，肩、頸肌力不足，無法支撐骨頭的重量，導致頸椎關節所受到的壓力過大，引起酸痛。