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Objective: To identify the frequency of presentation and causes in frequency-dysuria syndrome in female children, in the same way a descriptive analysis of laboratory and image studies. Material and Methods: A prospective study was made based in an algoritm designed an two approach protocols that were applied in an out patient consultation, not considering the age of the patient with symptoms of dysuria and frequency. Microbiology, urine and vaginal cultures, stool samples, urinary calcium/creatinion relation, miccional cystouretrogram and renal ultrasound test were indicated. Results: The prevalence was of two cases in every 1000 female children in wich the ages were between one and fifteen years old. Age group most affected was of preschool in 50% and schoolchildren in 28%. Most frequent etiology was vulvoganinitis in 56%. Urinary infection in 41%, followed by hipercalciuria in 3%. Urine cultures isolated E. coli and klebsiella sp. with high counts and low colony formation units, being this of the most importance. Vaginal cultures reported bacterial growth for klebsiella sp., E. coli, non hemolytic streptococcus, staphylococcus albus. Image studies conformid two cases of cystitis and one case of vesicoureteral reflux. Recurrent disease most frequent was intestinal giardiasis. Conclusions: Frequency-dysuria syndrome in female children is relatively common and affects primarily preschool and schoolchildren. Vulvovaginitis and urinary infections where the most common causes. Urinary cultures gram-negative bacteria where isolated with high counts and low colonies. In vaginal cultures where positive for gram-positive, gramnegative, parasites and fungus. Radiology studies proved the evidence of cystitis and urethral reflux. Recurrent disease was intestinal giardiasis. Finally we emphasize the usefulness of this syndrome as a clinical diagnosis in children. [ABSTRACT FROM AUTHOR]