There are two common causes of neck fatigue and weakness: first, chronic strain and acute injury to the neck, which is common among people who work with their heads down for a long time and those who often participate in sports that cause neck sprains. It is due to long-term chronic cumulative strain injury and acute injury, resulting in injury to the nerves and muscles of the neck, resulting in local swelling, poor blood circulation, resulting in the accumulation of anaerobic metabolic products, resulting in fatigue and weakness; second, is cervical spondylosis, due to the compression of the cervical spine, nerve root compression or spinal cord compression, resulting in abnormal nerve sensation in the neck, there will be Fatigue and weakness in the neck.