Frequent urination is a common symptom of Parkinson's disease, explains the University of California. Urinary problems that occur due to Parkinson's disease trigger several symptoms, including urgency, incontinence, frequency and repeated nighttime urination.
In Parkinson's disease, the part of the brain that controls the sphincter is usually disturbed, notes the University of California. The bladder becomes overactive, increasing the need to empty even when there is just a small amount of urine. Patients can use medications, such as Detrol, Ditropan and Hytrin, to relax the bladder. In some cases, patients may also experience difficulty urinating. This occurs when the bladder is full but the muscles are too weak to allow urination.