Pancreatic cancer survival time is usually about 1 week if you don’t eat. Some patients can reach several months with aggressive treatment. Pancreatic cancer patients who do not eat can result in systemic electrolyte disturbances, malnutrition, hypoproteinemia, ascites, and extreme lethargy, and without aggressive management, survival may be as little as 1 week. If active management can be carried out and a therapeutic regimen can be adopted, or parenteral nutritional infusions and nutritional support can be given, some of the survival time can be prolonged. However, parenteral nutrition has no way to replace the intestinal absorption effect of eating, often also leads to severe nutritional deficiencies, as well as micronutrient and vitamin deficiencies, and the survival time is generally only a few months. Pancreatic cancer patients should actively follow the medical advice. Adequate nutritional supply can maintain the functioning of the body, assist in controlling the disease and prolonging the survival time of patients.