Affecting millions of citizens, an overactive bladder is an extremely widespread health condition that severely affects the functionality of a bladder. Although this syndrome can affect anyone, it usually observed amongst the elderly individuals and women post pregnancy. What are the symptoms and causes of an overactive bladder? The most common overactive bladder symptoms are an unstoppable urge to pass urine, increased frequency in terms of bathroom visits, little or excess urinary leakage, and nocturia, i.e., frequent urination during the nighttime.