Doctors in medical school are taught that the bladder is a forgiving organ but patients with overactive bladder know otherwise. This is a debilitating condition whose older names are irritable bladder or unstable bladder. An overactive bladder is characterized by a sudden urge to use the toilet which cannot be delayed and often patients leak urine before getting there (urge incontinence).
Patients tend to use the toilet frequently and several times an hour and are often up several times in the night to empty their bladder. Some patients use the toilet and soon after, still feel the presence of more urine in the bladder and realize they need to go back (incomplete emptying or double voiding).