The reason for not clean urine after a while and urine flow out more, may be caused by urinary tract infection, neurogenic bladder, etc., there may also be prostatic hyperplasia, the specific causes and treatment are mainly the following: 1, urinary tract infection: urinary tract has bacteria or other pathogens infection, produce inflammatory stimulation, appear not clean urine after a while and urine flow out phenomenon, patients may also be accompanied by frequent urination, urinary urgency, pain or heat and other uncomfortable symptoms. Patients may also have symptoms such as frequent urination, urgent urination, painful urination or fever. In this case, you can follow medical advice oral anti-inflammatory drug treatment, at the same time pay attention to rest, drink more water, urinate regularly; 2, neurogenic bladder: is caused by neuropathy bladder, urethral dysfunction, in addition to the symptoms of unclean urine after a while and urine flow out, there may be urinary urgency, urinary frequency, urinary difficulties and other uncomfortable symptoms, for patients with more residual urine, you can follow medical advice catheterization treatment or cystostomy; 3, prostatic hyperplasia: more than a few days after the urine flow out of the symptoms, there may also be urinary urgency, urinary frequency, urinary difficulties and other uncomfortable symptoms. 3, prostatic hyperplasia: mostly occurs in middle-aged and elderly men, prostatic hyperplasia compressing the urethra, patients will have the performance of incomplete urination after a while there is urine flow out, there may also be frequent urination, urinary urgency, increased nocturia, difficulty in urination and other uncomfortable symptoms, the emergence of acute urinary retention should promptly seek medical attention, follow the medical advice of catheterization treatment, improve the acute discomfort, and then follow the medical advice of oral medication or surgery for treatment; 4. Other: When urinary stones and tumors occur, stones or tumors obstruct the urethra and may cause the phenomenon of unclean urine flowing out after a while, and patients may also have symptoms such as back pain and hematuria, etc. In this case, it is recommended to seek medical attention in a timely manner and choose lithotripsy, surgical treatment or chemotherapy according to the cause.