Need more info. There are so many possible causes that i can't list them all here; without more information on other symptoms, i can't narrow it down for you. I'd suggest seeing the doctor for diagnosis and any needed treatment.
What could be causing my frequent bowel movements in a morning and then ending in diarrhoea ie loose watery stools?
Is this new? Change in bowell habits, with watery stools needs a diagnostic work up. See your health care provider. Read more...