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The discharge of urine from the bladder. Also known as micturition.



(also called micturition), the reflex act of excreting urine from the body.

Uropoiesis—the production of urine—is a constant process, but urination occurs only intermittently, as the urinary bladder fills. Humans urinate four to six times daily. Urine is prevented from escaping from the bladder by two ring-shaped layers of muscle fibers: an internal sphincter, which consists of smooth muscle fibers, and an external one, which consists of striated fibers. When the pressure within the bladder reaches 2–2.66 kN/m2 (kilonewtons per square meter), or 15–20 mm Hg (millimeters of mercury), stimulation of the mechanoreceptors (the nerve endings of sensory neurons) in the wall of the bladder elicits the urge to urinate. In man, this critical pressure is achieved when 300–350 ml of urine accumulate in the bladder. During urination, the external sphincter relaxes reflexively as the muscles of the bladder wall contract.

Urination is regulated by the nerve centers in the spinal cord and brain; these centers are controlled, in turn, by the cerebral cortex. The filling of the urinary bladder arouses the cerebral cortex to elicit the urge to urinate. Certain neurological diseases, as well as injuries to the muscles of the urinary bladder, impair urination.


What does it mean when you dream about urination?

Urination in a dream has several interpretations that range from inhibited sexual desires to the outpouring of emotional feelings that have been repressed.


Releasing bodily wastes in a dream suggests a need to release repressed emotions and/or anxiety. At times, urination may have sexual connotations. Many people dream about the need to urinate, which wakes them up, and then they realize that they need to use the bathroom. At times, the dream triggers the physical sensation and other times the physical sensation may become a part of the dream.
References in periodicals archive ?
Nongonococcal urethritis: Nongonococcal urethritis (NGU) is the most common clinical sexually transmitted syndrome among men and is characterized by painful urination with or without discharge.
If the infection has spread to the kidneys, you may have fever, chills, nausea, vomiting and back pain, in addition to the frequent urge to urinate and painful urination.
Less common: Stomach ulcers, GI bleeding, hepatitis, gallbladder attacks, painful urination, poor kidney function, kidney inflammation, blood and protein in the urine, dizziness, fainting, nervousness, depression, hallucinations, confusion, disorientation, lightheadedness, tingling in the hands or feet, itching, increased sweating, dry nose and mouth, heart palpitations, chest pain, difficulty breathing, and muscle cramps.
Syed Hasnain Ali Johar, who practices in Model Town Hummak - a rural area of the Federal Capital, said appropriate use of carrot is helpful in fighting obesity, poisoning of the blood, gum disease, insomnia, inflamed kidney, liver, gallbladder, Alzheimer's disease, colitis, ulcer and painful urination.
Less common symptoms include painful urination, back aches, abdominal pain or weight loss.
By the time he noticed symptoms of painful urination, his cancer had spread into his liver and lungs, she said.
There are various symptoms which could indicate prostate problems, from frequent or painful urination, to sexual difficulties, and pelvis, hips, thighs or back pain.
F) painful urination and increased bowel movements during menstruation.
For males: painful urination location with highest infection and discharge of puss from rate for ages 10-24: the penis.
For 13 years, Myers, 34, has been afflicted with intestinal cystitis, a disease which causes frequent and painful urination.
Recent studies show that patients treated with the MonaLisa Touch Laser showed highly statistically, significant improvement in symptoms including dryness, pain, itching, painful urination and painful intercourse after the first treatment," says Dr.
Side effects during the Botox trials included urinary tract infections, painful urination, and urinary retention.