Positive occult hematuria, the correct name is positive urinary occult blood, is a kind of result of doing routine urinalysis, and needs to be considered to be related to inflammation, stones, tumors and other diseases. 1. Inflammation: if the patient has glomerulonephritis, when doing the examination, the red blood cell pattern inside the urine is usually metamorphic red blood cells, and the ratio is above 80%. If the ratio does not reach 80% or more, this needs to be considered to be caused by urinary tract infection and bladder inflammation and other conditions. 2. Stones: if the patient has stones, it will be found that the patient’s red blood cells are in normal form and the deformation rate does not reach more than 80%, and the patient may have symptoms such as hematuria and localized severe pain, which should be combined with CT or ultrasound examination to confirm the diagnosis. 3. Tumor: patients with tumor will have positive urinary occult blood test, and patients may also have local pain and other symptoms. In case of positive urinary occult blood, it is better to go to the hospital for further examination, and not to jump to conclusions.