The reason why back pain can’t be detected is because the causes of back pain are complex, and sometimes it is not easy to determine through imaging and clinical examination. Back pain may be due to physiological reasons such as exertion, improper posture, cold, etc., but also due to cervical spondylosis, ankylosing spondylitis, respiratory diseases and other pathologic factors. 1. Physiological factors: due to prolonged shoulder and back labor, local cold and other factors, or long-term low head work and play cell phone with improper posture, resulting in back muscle fatigue, tension and spasm, the phenomenon of pain in the back, more rest and change the bad posture can be gradually relieved. 2. Cervical spondylosis: such as intervertebral disc herniation, spinal stenosis, etc. can lead to compression of the spinal cord and nerve roots, and back pain will occur, accompanied by pain and numbness in one or both upper limbs. 3. Ankylosing spondylitis: an autoimmune disease, a chronic disease with the spine as the main lesion site, involving the sacroiliac joints, can cause spinal ankylosis and fibrosis, such diseases will appear persistent low back pain and stiffness. 4. Respiratory diseases: such as lung cancer, pleurisy, tuberculosis can lead to chest and back pain. In conclusion, the causes of back pain are very complex, so the diagnosis is also more difficult, it is recommended to observe more of their own discomfort symptoms in daily life, and consult a doctor in time to help the doctor to confirm the diagnosis.