Urinary occult blood 3 + generally suggests the occurrence of hematuria, the causes of which include urinary tract infection, glomerulonephritis, urinary stones, tumor-related diseases. 1. Urinary tract infection: patients with urinary tract infection may have hematuria, accompanied by urinary urgency, urinary frequency, urinary pain, elevated white blood cells and other symptoms. 2. Glomerulonephritis: nephritis is the common cause of positive urinary occult blood, in addition to urinary occult blood, proteinuria, edema and other symptoms. 3. Urinary stones: kidney stones and ureteral stones can cause positive urinary occult blood. 4. Tumor-related diseases: it is important to note that older and asymptomatic and painless hematuria is suspected to have a higher possibility of urinary tumor, which requires extra attention and relevant examinations, and then surgical treatment. Urinary occult blood 3 + patients need to go to the regular hospital in time to check to clarify the cause of the disease, and under the guidance of the doctor for standardized treatment, so as not to delay the condition.