When undergoing cancer treatment, diarrhea is a common. If the diarrhea increases it can lead to serious health complications. This is why it is important to avoid anything that can worsen the diarrhea. Coffee contains caffeine which for a long time has been linked to diarrhea. So if you are undergoing pancreatic cancer treatment, it is very important to avoid coffee. Don’t take tea as a substitute because even tea contains caffeine so it will also worsen your diarrhea. Just take some warm water and if you have to add some flavor, add some lemon or lime in the water. People who avoid coffee when they have pancreatic cancer tends to live longer than those who ignores and continue taking coffee.