There are several common reasons for tightness on both sides of the neck: first, neck muscle strain, long-term ambulation work or study, maintaining a fixed posture of the neck, can lead to strain on the neck muscles, muscle internal congestion and edema phenomenon, clinical manifestations of neck muscle stiffness and pain, through the neck muscle massage and bed rest, neck stiffness and pain symptoms can be significantly relieved in about a week, usually strengthen the neck Second, cervical joint disorders, poor sleep posture or inappropriate pillow height can lead to subtle misalignment of cervical joints during sleep, causing cervical joint disorders, with clinical manifestations of neck muscle pain, stiffness and limited cervical movement, and cervical stiffness and pain symptoms can be relieved after cervical rotation and rectification by manipulation.