High red blood cells in urine, the possible causes: First, acute infection of the urinary tract, there can be mucosal congestion, edema, accompanied by a little bleeding, mixed in the urine can appear high red blood cells, can be accompanied by elevated white blood cell count. Patients may have urinary frequency, urinary urgency, urinary pain, dysuria and other self-conscious symptoms. Second, when there are urinary tract stones, there can be local mucosal ulceration, bleeding, resulting in urinalysis showed elevated red blood cell count. Accompanied by stone site pain, lumbago, abdominal pain and other symptoms, need to further ultrasound to confirm the diagnosis of stones. Third, when suffering from tumors of the urinary tract, there can be tumor rupture, bleeding, resulting in increased number of red blood cells in the urine. Early stage can be manifested as hematuria without obvious pain, but with the further progress of the disease, the tumor volume increases or invades the surrounding organs and tissues, pain can occur, and need to perform CT examination of the urinary system to further exclude.