A few things can cause this:
1 - coffee consumption
2 - undereating (anorexia nervosa or CRON, to make poop you need raw material, those diets are often low in ruggage)
3 - b12 and other b vitamins being low (impacts peristaliasis)
4 - low fiber content (aim for 20+ grams a day AT LEAST)
5 - low bacteria count from low fodmap diets (eat chicory, inulin, celery, onions), stool is 50% dead bacteria
6 - some fat being left in the stool, especially if you eat oats, etc. they will bind it up and you will pass it out
I am dealing with same thing, the only thing that improves me is high carb, low fat diet, no dairy nor eggs. You should poop in a few seconds without pushing at all.
This is basically a form of diarrhea, ie between 4 - 5 on bristol chart - and it says it right there - more fibre. Of course you could try loperamide which works wonders on this and is fairly safe, especially if you are doing CRON then increasing transit time could be beneficial (maybe).
Do you have an urgency for bowel movement? Do you feel you don't pass stool fully? Do you sometimes go a second time after pooping (an hour or two later)? Do you have symptoms of gas or bowel dystention and pain? This could all point to the diagnosis of IBS...
Edited by vader, 21 May 2016 - 05:10 PM.