Women’s back pain on the left side of the back does not necessarily have to be wary of any disease, it may be caused by trauma, muscle strain, intercostal neuritis, cervical and dorsal myofasciitis and other reasons. 1. Trauma: when the left side of the back of women by collision, resulting in local soft tissue damage, may cause the phenomenon of the left side of the back pain. 2. Muscle strain: If a woman is engaged in heavy physical labor for a long time, or stands for a long time and sits for a long time, it may also lead to chronic strain of the shoulder muscles, which may cause pain on the left side of the back. 3. Intercostal neuritis: the pain on the left side of the back of women may be caused by intercostal neuritis, which is mainly manifested as stabbing or sharp pain, and the pain will be distributed from back to front in a semi-circular shape. 4. Cervical dorsal myofasciitis: women’s back pain on the left side of the back, may also be caused by cervical dorsal myofasciitis, due to a long time to maintain the same posture, the muscle fibers will be damaged, resulting in back, shoulders and neck, and other parts of the phenomenon of pain. There are many reasons for women to have pain on the left side of the back, they should go to the hospital in time, and under the guidance of the doctor for appropriate treatment and therapy.