Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the treatments for Nerve Disease and Bladder Control ?
    ### Response:
    Urine retention may occur either because the bladder wall muscles cannot contract or because the sphincter muscles cannot relax.
                
Catheter. A catheter is a thin tube that can be inserted through the urethra into the bladder to allow urine to flow into a collection bag.
    