Lumbar stiffness and tightness may be caused by myofasciitis, osteophytes and ankylosing spondylitis. 1. Low back myofasciitis: Low back myofasciitis is one of the main diseases causing low back pain, which can be caused by improper posture, long-term work, heavy lifting, cold and other reasons. Patients often manifest lumbar back pain, weakness, and even burning, tingling, hardness and tightness. 2. Osteoplasia, degeneration: lumbar vertebral osteophytes are mainly related to age, strain, trauma, incorrect posture and other factors. It is often manifested as lumbar spine and lumbar soft tissue pain, swelling and fatigue, and even bending limitation. If the neighboring nerve roots are compressed, it may cause corresponding symptoms, such as local pain, hardness and tightness, posterior root neuralgia and numbness. 3. Ankylosing spondylitis: Ankylosing spondylitis in the early stage may appear in the low back and hip pain, stiffness (that is, hardness and tightness) and other symptoms, especially in the morning and after rest, in addition, neck pain and fatigue is also very common. There are many reasons for these symptoms, and it is recommended that you visit a hospital promptly for early and regular treatment.