It can be genetic or it can be caused by chronic constipation which stretches the colon, makes is longer, so it creates loops and turns to fix inside the space it has. Easier to become constipated. You may never know you have it, or like those of us sharing here, you find out from a colonoscopy that was difficult or impossible to complete. And even then it may not be causing problems, but one day it just might change your life. And then you have to find out what works for you, to keep things moving regularly. Just my experience.