Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Aneurysm ?
    ### Response:
    An aneurysm (AN-u-rism) is a balloon-like bulge in an artery. Arteries are blood vessels that carry oxygen-rich blood to your body.
                
Arteries have thick walls to withstand normal blood pressure. However, certain medical problems, genetic conditions, and trauma can damage or injure artery walls.
    