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The mechanism that is involved in urinary loss is unknown. Probably it unleashes reflex urination involving the action of a "trigger". The disturbance occurs in both sexes, but it appears with more frequency in women. Normally the symptoms appear between de ages of 5 to 7 and they have a tendency to disappear after adolescence, but it may persist when they are adults. The use of the denomination "enuresis risoria" was proposed by De Jonge, as a way to characterize it as an involuntary urination and as a "normal" characteristic, unleashed by laughter. Most authors believe that the problem is in connection to a specific disturbance of the central nervous system, meanwhile, the neurological exam and the use of an electroencephalography did not reveal any alterations. The occurrence of the problem might be bigger than is presumed. Popular expressions like "I laughed so much that I peed in my pants" or "I laugher so much that I almost peed in my pants", indicate that the phenomena might appear in different degrees of intensity, sometimes so intense and associated to urinary loss. In determined situations only urgency appears4. Laughter or a burst of laughter would constitute in a specific stimulus acting on the urination reflex and the laughter incontinence would only represent a variation in the physiological sensibility or specific control. In adult life it is rare that urinary loss may become a serous problem for the daily activities. For children satisfactory results were described with the use of metilfenidate 3 to 4 times a day5. Arena and collaborators, with the use of imipramine, treated an adolescent with the disturbance successfully1.