Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hemorrhoids ?
    ### Response:
    Hemorrhoids are swollen, inflamed veins around the anus or lower rectum. They are either inside the anus or under the skin around the anus. They often result from straining to have a bowel movement. Other factors include pregnancy, aging and chronic constipation or diarrhea.
    