Main aspects of the Diagnosis of Stress Urinary Incontinence (SUI) The urinary incontinence is a symptom that can be caused for several situations. The complains frequent in both sexes and in the several age groups, its appropriate treatment begins in the correct diagnosis of the causal factor. In the women's specific case that She complains about SUI, two questions initials should be made: 1 - is it really SUI? 2 - which the best form of treating this patient ? Those questions are asked with larger concern in some situations special, as in the case of having had failure in the previous treatment. The first step in the evaluation diagnostic is well a clinical history done. The perfect characterization of the main complaint has for objective to classify the patient in one of the three main categories, the one of loss to the efforts, the of loss with urgency symptoms or of frequency, and the loss with symptoms mixed. The severity of the loss should be graduated, trying to verify if this happens during small or big efforts. The use of the mictional schedule and of the pad test it has been enough valued in the quantification of the loss. The history clinical trouble previous is also important. Previous surgeries, mainly the pelvic surgeries extensive and those for correction of SUI, they should be questioned. The possibility of concomitant neuropathy also has to be investigated. Soon after we have the physical exam. The exam of the perineum and of the vaginal introitus it can indicate us hipoestrogenism states. With the patient in position gynecological and with the bladder comfortably full, we should observe the degree of mobility urethral, the prolapse existence, and leak in to urethra during efforts. On that moment we can evaluate by force of the contraction of perineum, that helps us to identify patient with lesions fascias of the pelvic floor. The routine laboratorial should include the urine culture. The presence of urinary infection can provoke symptoms of the frequency and urgency. The evaluation for image method is advisable. The approach transperineal can not to be used to evaluate the position and the mobility of the junction urethro-vesical. The morphology of the detrusorl, as well as the residue post urination, they should be observed. Other concomitant diseases should be discharded through the complementation of the exam for abdominal approach. The urodynamic studyc an be made, being obligatory in situations specific: 1 - when the exams diagnoses are inconclusive, 2 - when there is, in the image exam, alterations as detrusor hypertrophiel, residual post urination and another that take to the suspicion of functional disease of the bladder, 3 - when the urine loss cannot be verified in the physical exam, 4 - when there are complaints frequency and urgency or complex, 5 - when there was previous surgery for treatment of SUI, 6 - in women submitted to wide pelvic surgeries, as the ressection abdomino perineal of the rectum or the radical hysterectomy, 7 - in submitted patients the pelvic radiotherapy, and 8 - in patient carriers or with neuropathy suspicion. During the urodinamic study we have to have the care of reproducing the symptom of loss, characterizing the involved event correctly. Loss there was been with effort, we tried to determine whenever possible the loss pressure. Special attention should be given to the investigation of the presence or not of contractions involuntary of the detrusor, mainly in the patients with complaints frequency and urgency. The cystoscopy is not routine exam, but it should be done in cases us which, in elapsing of the routine evaluation, it was suspected of another alterations, as lithiasis vesical, tumors of the urotelium, etc.