Women’s left arm pain may be caused by cervical spondylosis, frozen shoulder, tennis elbow, etc. It may also be a sign of serious illness such as brain tumor, which requires timely consultation to clarify the cause. 1. Cervical spondylosis: If the herniated cervical disc compresses the nerve root, it may cause numbness and pain in the left arm. 2. Frozen shoulder: due to aseptic inflammation around the shoulder, it can manifest as pain and limited movement of the left arm. 3. Tennis elbow: Chronic tearing and straining caused by long-term and repeated pulling of forearm extensor muscles can cause symptoms of left arm pain. 4. Brain tumor: If the tumor occurs in the parietal lobe, it can lead to unilateral limb pain. It is recommended that women with left arm pain should go to regular hospitals in time to clarify the cause of the disease and carry out standardized treatment under the guidance of doctors, so as to avoid delaying the condition.