Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Benign Tumors ?
    ### Response:
    Tumors are abnormal growths in your body. They are made up of extra cells. Normally, cells grow and divide to form new cells as your body needs them. When cells grow old, they die, and new cells take their place. Sometimes, this process goes wrong. New cells form when your body does not need them, and old cells do not die when they should.
    