Both sides of the tendons in front of the neck, general sternocleidomastoid muscle, both sides of the sternocleidomastoid muscle pain to be alert to the neck muscle strain, pillow, cervical degenerative changes and other diseases. 1. Neck muscle strain: mostly seen in desk work, long-term head down, looking at the computer and other poor posture, causing muscle pain on both sides. 2. Pillow fall: due to poor sleeping posture, the head and neck are in a state of hyperextension or hyperflexion, causing tension in the neck muscles, resulting in muscle pain on both sides. 3. Cervical degeneration: due to the degeneration and hyperplasia of the cervical vertebrae, aseptic inflammation of the muscles on both sides of the cervical vertebrae occurs, resulting in pain. There may also be other causes of pain in the tendons on both sides of the front of the neck, such as trauma, frozen shoulder, etc. It is recommended to go to the hospital in time to improve the examination, to clarify the cause of the disease, and to carry out standardized treatment under the guidance of the doctor.