The causes of back stiffness include back muscle strain, cervical spondylosis and lumbar disc herniation. 1. Back muscle strain: engaged in high-intensity physical labor due to overworked people easy to lead to shoulder and back muscle strain, strain, muscle stiffness, pain symptoms. 2. Cervical spondylosis: spinal disease compresses the nerves and radiates to the back, causing back muscle stiffness, pain, dizziness, numbness of the upper limbs and other symptoms. 3. Lumbar disc herniation: labor-intensive, long-term ambulatory population is common, in addition to the performance of the lumbar back muscle stiffness, lumbago with sciatica is the main symptom, activity, coughing, sneezing, bending pain intensified, lying down and resting can be relieved. There may be other causes of back stiffness, if the symptoms of back stiffness are not relieved for a long time, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.