Pancreatic tail 3*4cm is not very serious if it is a benign tumor, and more serious if it is malignant. Pancreatic tail 3 * 4cm tumor belongs to the volume is relatively large, but is not serious also need to be combined with the nature, staging and other circumstances of analysis. If it is a benign tumor, although the tumor is relatively large, but there will be no metastasis and proliferation, timely surgery can be resected to achieve a cure, and the late recurrence rate is relatively low, so it is not very serious. However, if it is a malignant tumor, no matter how big or small it is, it is more serious, if not treated in time, lymphatic and distal tissue metastasis and proliferation will occur, thus endangering the patient’s life, and once found, it needs to be treated by means of surgery, radiotherapy, chemotherapy, and targeted therapy, etc. If it is suspected or diagnosed as a pancreatic tumor, it will not have metastasis and proliferation. If pancreatic tumor is suspected or diagnosed, it is recommended to go to regular hospitals for comprehensive assessment of the condition and follow the doctor’s instructions to avoid delaying the condition.