Frequent urination, urgency, painful urination and old dandruff-like tissue in the urine may be caused by urinary tract infection, urinary tract stones and urinary tract tuberculosis. 1. Urinary tract infection: inflammation occurs in the urinary tract due to bacterial infection, and the inflammation stimulates the urethral mucosa to cause damage to the urethral mucosa, resulting in frequent urination, urinary urgency, urinary pain symptoms, and dandruff-like tissue can be seen in the urine. 2. Urolithiasis: Urolithiasis stone embedded, resulting in urinary tract obstruction and urethral mucosa damage, resulting in urethral mucosa detachment to the urine along with the urine, and urinary tract obstruction is likely to cause urinary frequency, urinary urgency, urinary pain and flocculent symptoms. 3. Urinary system tuberculosis: Mycobacterium tuberculosis invades the kidney, ureter, bladder and other parts of the formation of tuberculosis nodules and caseous nodules, nodule surface tissue can be flushed by the urine and discharged as dandruff-like tissues, Mycobacterium tuberculosis will stimulate the urethra to cause urinary frequency, urinary urgency, urinary pain and other symptoms. Frequent urination, urinary urgency, urinary pain, dandruff-like tissue in the urine should go to the hospital in a timely manner to improve the examination, clear cause to give targeted treatment.