Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Diarrhea ?
    ### Response:
    Diarrhea is loose, watery stools. Having diarrhea means passing loose stools three or more times a day. Acute diarrhea is a common problem that usually lasts 1 or 2 days and goes away on its own.
                
Diarrhea lasting more than 2 days may be a sign of a more serious problem.
    