The most common causes of cervical stiffness and tightness are poor posture, muscle spasm and cervical spondylosis. 1. Poor posture: If the patient maintains a poor posture for a long time, long-term work with the head down, it is easy to cause stiffness and pain in the neck muscles, usually change the posture and rest sufficiently after the symptoms can be relieved. 2. Muscle spasm: If the patient is in a low-temperature environment, the cold stimulus is easy to cause muscle spasm, which in turn induces the stiffness of the neck muscles, neck pain and other uncomfortable symptoms, you need to pay attention to keep the neck warm. 3. Cervical spondylosis: If the patient has a history of cervical spondylosis, cervical intervertebral discs will degenerate with age, the protruding cervical intervertebral discs compress the surrounding soft tissues, it is easy to induce stiffness of the neck muscles and pain. Causes of cervical stiffness and tightness are more reasons, may also be related to trauma, frozen shoulder and other factors, if the symptoms continue to have no relief, it is recommended to go to the hospital in a timely manner to find out the cause of the disease, by the doctor targeted treatment.