The causes of women’s left shoulder pain include acute trauma, chronic injury, frozen shoulder, cervical spondylosis, cervical fibrositis, etc. 1. Acute trauma: acute trauma leads to neck and shoulder pain, if not treated in time, it will develop into chronic traumatic inflammation. 2. Chronic injury: long-term work, long-term use of the left upper limb for labor, etc., can lead to continuous weight bearing on the shoulder, which will lead to chronic strain injury, manifested as chronic pain in the back of the neck and shoulder. 3. Frozen shoulder: mostly occurring in women around 50 years old, manifested as adhesion, stiffness, pain and limited movement of the shoulder joint. 4. Cervical spondylosis: when cervical spondylosis compresses the nerve root, it manifests as pain in the neck and shoulder, radiating to the upper limbs and limiting the activities of the affected limbs. 5. Cervical fibrositis: non-specific aseptic inflammation of the fascial muscles caused by a variety of factors, manifested as neck, shoulder and back pain. The causes of left shoulder pain in women also include angina pectoris, pleurisy, herpes zoster and lung tumors, etc. They should seek medical treatment in time, diagnose and treat under the guidance and observation of professional doctors and follow medical advice.