Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose What I need to know about Diarrhea ?
    ### Response:
    To find the cause of diarrhea, the health care provider may
                
- perform a physical exam  - ask about any medicines you are taking  - test your stool or blood to look for bacteria, parasites, or other signs of disease or infection  - ask you to stop eating certain foods to see whether your diarrhea goes away

    