What causes occult blood in urine?

Urinary system infection and urinary system stones can lead to symptoms of occult blood in urine. Common urinary system infection diseases include cystitis, infection can induce inflammation. When the urinary system shows inflammation, the epithelium will be stimulated by inflammation, which will show skin edema and hematoma accompanied by minute bleeding symptoms. When the blood cells of the outer skin enter the urine, they will be separated from the body with the excretion of urine. Excretion will show symptoms of occult blood in urine. Moreover, due to the human urinary system shows stones, such as urinary stones and other diseases, hard stones deposited in the body will scratch the mucous membrane in the body, so it shows local bleeding, blood will be mixed into urine, check out occult blood positive, will show symptoms of occult blood in urine, and will be accompanied by pain in the waist and abdomen, sometimes the pain will be more intense.