Back pain after coughing is a manifestation of lung cancer, but this manifestation is not necessarily caused by lung cancer, and not all lung cancer patients will have it. Back pain after coughing usually enhances the malignant tumor has already invaded chest wall tissues, then lung cancer patients will have irregular hidden pain or dull pain in chest, back and shoulder, etc. This pain will be aggravated when coughing, and when there is persistent and more intense chest pain and back pain, it usually indicates that the malignant tumor has already widely invaded chest wall tissues. However, not all lung cancer patients will have back pain when coughing, for example, in the early stage of the disease, when the malignant tumor has not invaded the neighboring tissues and organs, patients will not have this symptom. In addition, not all back pain after coughing is caused by lung cancer, for example, limited pleurisy may also appear this phenomenon. Those who have back pain after coughing should go to regular hospitals in time to find out the cause of the disease and cooperate with doctors for active treatment.