Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hair Loss ?
    ### Response:
    You lose up to 100 hairs from your scalp every day. That's normal, and in most people, those hairs grow back. But many men -- and some women -- lose hair as they grow older. You can also lose your hair if you have certain diseases, such as thyroid problems, diabetes, or lupus.
    