There are many possible causes of urinary tract occult blood (++++), it is recommended to go to the hospital for examination to clarify the specific disease. 1, there may be urinary tract infection, after infection, the urinary tract mucosa will appear erosion, red blood cells in the urine will appear occult blood (++++) changes. 2, urinary tract stones, such as kidney, ureter or bladder stones can lead to mucosal bleeding, usually accompanied by lumbar abdominal pain. The pain, combined with the occult blood (+++) can initially determine the possible existence of stones, need to carry out ultrasound or CT examination of the urinary system to confirm the diagnosis. 3, tumors of the urinary tract, especially in elderly patients with occult blood in urine (+++), to carry out CT examination of the urinary system to exclude the presence of tumors of the urinary tract, such as kidney, ureter or bladder tumors can lead to bleeding and cause occult blood ( +++). 4, kidney, ureter or bladder tumors can lead to bleeding and cause occult blood ( +++). +++).4. Renal contusions or bladder contusions, such as lumbar trauma or lower abdominal trauma, blows, impacts, etc., can lead to bleeding due to transient contusions of the mucosa, and then occult blood (+++) may occur, but there is usually a clear history of injury.