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Your diarrhea has continued for a month, making it more chronic and persistent rather than acute.  The possible causes are long, but chronic infection is a concern, especially if you've recently traveled out of the US.  Other diagnoses to consider are chronic pancreatitis, celiac disease, lactose intolerance, and possibly even stomach or intestinal cancer, to name a few.  Try to pay attention to any recent changes in your eating habits or if you've started taking a new medication recently.  Be very careful not to let yourself get dehydrated and go see your doctor ASAP.