The vast majority of malignant tumors are generally cancerous and originate from epithelial tissue. One of the features is that the envelope may be incomplete and there may be infiltration of other surrounding tissues. In addition, there may be a rupture of the envelope, resulting in bleeding as well as heavy pain. Malignant tumors also have the characteristic of infinite proliferation of cancer cells, and the diagnosis can usually be confirmed by pathological examination. Other tests, including general examination, imaging and tumor markers, can be used as reference for the diagnosis of malignant tumor. In some cases, it is difficult to obtain pathology for malignant tumors, such as pancreatic malignant tumors, and it is risky to perform pancreatic aspiration, but we can make a clinical diagnosis of pancreatic cancer with the tumor marker CA19-9, if this index is greater than 400 kU/L, combined with the imaging examination to find pancreatic occupancy.