Re: Constant diarrhea...
This is rather common, and can be drawn back to sudden diet changes, or static eating, or even plain old stress.
What's your typical meal like? How many times a day do you eat? Do you eat off the hour, as in, do you eat late at night, or only a few moments before sleeping?
Stress can also cause this. Are you often stressed?
Another factor in this could be a lack of exercise. Exercise, even if it's not at all intensive, or consistent, is key in the proper functionality of our insides.