Shoulder and back pain caused by lung cancer is characterized by progressive aggravation, mostly occurring on one side, accompanied by numbness of limbs and weakness. 1. Progressive aggravation: with the aggravation of lung cancer, shoulder and back pain will be aggravated gradually, and the patient may change from mild pain to severe pain, accompanied by coughing and coughing up sputum, blood in sputum, etc. When lung cancer has bone metastasis in the shoulder and back area, it will also cause pain in the corresponding area. Lung cancer with bone metastasis in the shoulder and back area will also cause pain in the corresponding area. 2. Mostly occurring on one side: if there is no cancer in both lungs, shoulder and back pain caused by lung cancer usually occurs on one side. 3. Numbness and weakness of limbs: shoulder and back pain caused by lung cancer is often accompanied by weakness and numbness of the affected limbs, and at the same time, it may be accompanied by systemic symptoms, such as weight loss. Whether lung cancer is present or not cannot be determined by the characteristics of shoulder pain, but needs to be judged comprehensively by combining with medical history and relevant laboratory tests. Patients who have shoulder pain or are diagnosed with lung cancer should actively consult a doctor for standardized treatment to avoid delaying the condition.