Male left back pain may be muscle strain, pleurisy, coronary heart disease, cervical spondylosis, intercostal neuritis, ankylosing spondylitis, fasciitis and other causes. 1. Muscle strain: If you engage in heavy physical activities for a long time may cause chronic strain on the muscles of the lower back, pain, aggravated by exertion, rest to alleviate, you can take massage, massage, hot compresses and other physiotherapy. 2. Pleurisy: usually caused by viral, bacterial or tuberculosis infection, mostly accompanied by cough, sputum, fever, pain associated with deep breathing. 3. Coronary heart disease: when angina pectoris occurs, it can involve the left back pain, chest tightness, shortness of breath, chest pain, which lasts less than thirty minutes, and can be clearly diagnosed by electrocardiogram. 4. Cervical spondylosis: osteophytes or nucleus pulposus protruding and compressing the nerves can lead to back pain, and MRI films can be taken to make a clear diagnosis. 5. Intercostal neuritis: the pain is distributed along the ribs and aggravated by coughing. 6. Ankylosing spondylitis: early manifestation of low back pain, night pain is obvious, accompanied by morning stiffness. 7. Fasciitis: chronic strain caused by aseptic inflammation of the fascia manifested as back pain, bending activities are limited. Male left back pain if more intense, rest did not reduce, need to go to the hospital in time, clear cause for the cause of treatment.