Pain in the left back of women is commonly caused by muscle strain, cervical spondylosis, heart factors, etc., as follows: First, muscle strain: the left back has oblique muscles, latissimus dorsi and rhomboid muscles, and prolonged improper posture or overexertion can cause strain on the above muscles. The patient will have left back pain, muscle spasm, stiffness and other symptoms, the symptoms are more obvious when pressed, and the symptoms will be relieved after hot compress treatment. Second, cervical spondylosis: cervical spondylosis attacks will cause edema of the nerve root on one side, resulting in the left side of the back radioactive pain symptoms, accompanied by neck pain and limited activities. Third, cardiac factors: angina pectoris, myocardial ischemia and other diseases will cause the left side of the back involved in pain symptoms, usually more obvious, but pressure on the local does not have significant pain symptoms, electromyography or ultrasound examination can find cardiac abnormalities.