The tendon pain on both sides of the neck may be caused by pillow fall, muscle strain, myofasciitis and other factors. 1. Falling pillow: the etiology of falling pillow is not clear, considering that the sleeping position is abnormal, sleeping pillow is too high and other factors. Patients will experience muscle pain on the affected side, obvious limitation of neck activity, muscle ankylosis and other manifestations. 2. Muscle strain: Muscle strain may be caused by local muscle pulling or excessive muscle tension. Patients will experience muscle pain, muscle stiffness and weakness, muscle spasm and other symptoms, if the patient has a neck muscle strain will appear on both sides of the neck tendon pain. 3. Myofasciitis: the cause of myofasciitis is not clear, and it is considered to be related to prolonged or repetitive activities. Patients will experience muscle pain, muscle tension, limited activities, if the patient’s neck myofasciitis will be manifested in both sides of the tendon pain. It is recommended to consult a doctor to check the cause of myofasciitis, and take appropriate measures under the guidance of the doctor.