Urine inside the flocculent color reddish may be urethral inflammation, urinary stones, urinary malignant tumors and other causes. 1. Urethral inflammation: inflammation of the urethra occurs, inflammation will stimulate the urethral mucosa, resulting in urethral mucosal damage bleeding, can also lead to an increase in the urethral exudate, urination that is visible in the color of reddish flocculent. 2. Urolithiasis: Urolithiasis stone embedded, the surrounding normal tissue damage to the urethra, when urinating, the damaged tissue is discharged along with the urine, which is manifested as a reddish flocculent. 3. Malignant tumor of urinary system: bladder cancer, kidney cancer and other malignant tumors of the urinary system, due to the rapid growth of tumor surface nutrient deficiency and thus necrosis and shedding, can be discharged with the urine, resulting in reddish flocculent in the urine. Therefore, urine flocculent color reddish should go to the hospital in a timely manner to improve the examination and give targeted treatment after the cause of the disease is clear.