If you have pancreatic cancer, it has some side effects like difficulty in swallowing. If you are already having troubles swallowing things then it will be for the best if you avoid foods that are tough on your throat during swallowing. Toast is very tough on the throat and should be avoided at all cost if want to be comfortable. It will irritate your throat which will cause a lot of discomfort. Consult your doctor so that you can know other foods that irritates your throat during swallowing.