Can urinary incontinence be caused by decreased (improper) nerve function of the sacral nerve supply?

Yes: The nerve centers in the sacrum are very important for bladder function. One of the most important centers is at s3. Loss of s3 function can cause urge incontinence, bladder spasms, urinary retention or stress incontinence.

Yes: The sacral nerves are necessary for bladder contraction. Overflow incontinence and sphincteric incontinence is possible with severe nerve dysfunction.

Yes: Yes, but this is rare, especially in women in your age group unless there is a spinal cord tumor or a traumatic spinal injury involving the lower lumbar/ sacral spine.

Yes: Often urge, frequency and urge incontinence can be caused by sacral nerve disorders. There are other disorders that can also effect pelvic floor functioning