Falling pillow, also known as loss of pillow, medical diagnostic name called acute periarthritis of the cervical spine, as well as myofasciitis of the neck and shoulders, is a common soft tissue disorder of the neck. Common causes include poor posture, cold stimulation and underlying diseases. 1. Incorrect head and neck position: prolonged time in excessive deflection position, such as poor sleep posture at night, long time writing, reading; or because of sleep pillow is not suitable, too high, too low or too hard, so that the head and neck is in the state of hyperextension or hyperflexion, can cause muscle tension on the side of the neck, so that the cervical spine joints are distorted, and static injuries can occur in the longer time. 2. Cold stimulation of the neck and shoulders from the outside world: If the shoulders are exposed during sleep, the blood circulation in the back of the neck is relatively stagnant, resulting in muscle spasm, and then pillow fall will occur. It can also lead to stiffness and pain. 3. Underlying diseases: such as cervical spondylosis, cervical spine joint misalignment, chronic strain of the neck muscles, due to the imbalance of the dynamics of the neck muscle groups, it is easy to recur to fall asleep, and recurring fall asleep, in turn, will lead to cervical spondylosis, which can form a vicious circle. Patients can try massage, hot compresses and other methods to relieve pain, if unable to relieve or recurring attacks, it is recommended that patients go to the hospital in time to determine the optimal treatment plan based on the condition and comprehensive situation.