Vest pain in cancer patients is mainly seen in two major types of common malignant tumors: 1) primary cancer, without metastasis to multiple organs of the body, the most common type of cancer at this time is pancreatic cancer. The most common type of cancer is pancreatic cancer, which is located close to the back and invades the posterior peritoneal nerve. 2. Other malignant tumors, including stomach cancer, intestinal cancer and breast cancer, which have metastases throughout the body, especially bone metastases, will cause back pain in the back, and usually require further PET-CT examination for a clear diagnosis.