The pancreatic gland grows in the posterior peritoneal cavity, therefore, pancreatic cancer starts insidiously and there are no obvious symptoms in the early stage, while once the symptoms such as wasting, pain and jaundice appear, it is already in the middle and late stage and the best time for surgery is missed. In addition, pancreatic cancer develops rapidly and has a high mortality rate, often only a few months from the appearance of early symptoms to the late stage until the patient dies, which makes early detection, diagnosis and treatment of pancreatic cancer very difficult. The reasons why early detection of pancreatic cancer is difficult are summarized as the following 4 points: 1. The incidence of pancreatic cancer is low, about 1 in 10,000. 2. The anatomical location of the pancreas determines its insidious clinical symptoms, because the pancreas is a posterior organ of the human peritoneum, located deep in the body and covered by the stomach and the transverse truncal layer. It is difficult to detect small diameter pancreatic tumors in the early stage of ultrasound examination, and it is not easy to catch the early “traces” of pancreatic cancer in a timely and accurate manner if the diameter is large, because the ultrasound examination result depends largely on the clinical experience and subjective judgment of the ultrasonographer. Although PET-CT is the most effective diagnostic device for detecting early pancreatic cancer, it is difficult to become a screening test for the general public due to its high cost. Pancreatic cancer mainly manifests itself as non-specific symptoms, such as hidden pain and discomfort in the upper abdomen, indigestion and pain in the lower back, which can be relieved after symptomatic treatment, thus delaying the best time for diagnosis and treatment. 3.Pancreatic cancer itself progresses rapidly, and the natural course of the disease is 3-6 months after diagnosis. Due to its rapid development, the time window in which surgical interventions can be applied is relatively narrow. 4. The sensitivity and specificity of tumor indicators for the early diagnosis of pancreatic cancer are not high, which is also one of the reasons why pancreatic cancer is difficult to be detected at an early stage. CT and PET-CT examinations are undoubtedly the two most effective examinations for the diagnosis of pancreatic cancer, which can show the location, size, dilatation of pancreatic duct or bile duct, vascular invasion and lymph node metastasis of pancreatic cancer. 2. Prevention of pancreatic cancer: 1. Diet: Gastrointestinal tumors have a common predisposing factor, which is diet. Therefore, to avoid the occurrence of digestive tract tumors, special attention should be paid to the dietary content and eating habits. In terms of diet content, eat more light fresh fruits and vegetables and less greasy food. In terms of eating habits, we should have three meals regularly and quantitatively, not overeating; we should chew and swallow slowly, not gobbling. 2.Symptom warning: Even if pancreatic cancer is hidden, there will be some warning and symptoms, otherwise, with the development speed of pancreatic cancer, it is very likely to be late when it is diagnosed. Patients with pancreatic cancer mainly have some digestive reactions, such as upper abdominal discomfort, distension and pain, improper appetite or indigestion, and with the infiltration of cancer cells, patients will also have more obvious symptoms such as jaundice. We should not talk about malignant tumors, human beings have become more and more powerful in front of cancer, but “early detection, early diagnosis and early treatment” is still the most powerful weapon to deal with malignant tumors, and the same is true for pancreatic cancer.