The urinary system (or urinary tract) works as your body’s filtration system. When your urinary system removes toxins and wastes from your body, it comes out as pee (urine). To be able to pee, your body must pass this waste through a series of organs, ducts and tubes. If there’s a problem at any step in this process, it can affect if you’re able to pee normally.

Reference: https://my.clevelandclinic.org/health/body/21197-urinary-system