With the ageing of population, the mictional disorders affect 35 at 47% of men 50 years old in many studies. The origins are numerous but especially dominated by prostate adenoma. For this reason, the semiology of mictional disorders of men is necessary at diagnosis orientation and for specific complementary examination. A meticulous interrogation is necessary because these disorders are ignored by the patients or under-estimated and on specific clinical examination. Here, we look at the functional signs and the clinical of prostatic adenoma, prostatisis, prostate cancer and uretral stenosis. Also practical conducting in urine blockage is reviewed.