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Nocturia is defined by the International Continence Society (ICS) as "the complaint that the individual has to wake at night one or more times for voiding (i.e., to urinate)". [1] The term is derived from Latin nox – "night", and Greek [τα] ούρα – "urine". Causes are varied and can be difficult to discern. [2]
Nocturia is the need of frequent urination at night. [1] The most common cause of this condition for women and children is a urinary tract infection. The most common cause of urinary frequency in older men is an enlarged prostate. [2]
Overactive bladder (OAB) is a common condition where there is a frequent feeling of needing to urinate to a degree that it negatively affects a person's life. [2] The frequent need to urinate may occur during the day, at night, or both. [4] Loss of bladder control (urge incontinence) may occur with this condition. [1]
It is characterized by an obstruction of the bladder as a result of a non-neurogenic cause, which is due to the muscles controlling urine flow that do not completely relax. Symptoms may include daytime wetting, night wetting, urgency, a feeling that the bladder is always full, and straining to urinate.
When of gradual onset, symptoms may include loss of bladder control, mild lower abdominal pain, and a weak urine stream. [1] Those with long-term problems are at risk of urinary tract infections. [1] Causes include blockage of the urethra, nerve problems, certain medications, and weak bladder muscles. [1]
In flaccid bladder (also known as lower motor neuron or hypotonic bladder), the muscles of the bladder lose ability to contract normally. This can cause the inability to void urine even if the bladder is full and cause a large bladder capacity. The internal urinary sphincter can contract normally, however urinary incontinence is common.
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