What is this condition?

What is it called when the stool pass too quickly through your digestive tract? Is it a symptom of some disease or is it due to diet?What is this condition?
It could be any.
Doctors usually say to chomp through more fiber to bulk up the stool. (bran, oats, whole particle bread, pasta, and cereal, sweet potato, beans, even fiber supplements)
Dr. Oz on the Oprah show one day said your stool should come out approaching an "S" shape.
If you do this for a few weeks and it hasn't helped turn to a doctor and see if it is some disease.
Irritable Bowl Syndrome. or IBS. It's not fun, I have it once contained by a while. It can be hereditary, diet, stress, a bunch of things. Eat a soaring fiber diet and stay away from crappy food and drink a lot of dampen.
could be from either. if it happen for a long period of time you could hold an irritable bowel disease which needs to be see by a gi doctor