Detrusor muscle hyperreflexia resulting in urinary incontinence suggests there is neurologic problem resulting in uncontrollable contractions of the detrusor muscle of the bladder. Detrusor hyperreflexia is very often caused by problems affecting the spinal cord and/or brain. Your doctor could be concerned about medical or neurological conditions such as: cancer, multiple sclerosis, degenerative neuron disease, stroke, or spinal cord injury.