The appearance of urinary occult blood + exclude women menstruation may exist in addition to contaminated specimens, usually suggests that the patient may have hematuria. The harm is related to the cause of hematuria, if it is physiological reasons such as exercise hematuria, there may be no obvious harm; if it is pathological reasons such as urinary tract infection, urinary stones, urinary tract tumors, etc., may cause a series of harm to the body. 1. Urinary system infection: urine occult blood + and urine routine leukocyte level exceeds the standard, such patients can be confirmed as urinary system infection. Patients with hematuria may also be accompanied by urinary frequency, urinary urgency, urinary pain and other clinical manifestations. 2. Urinary stones: If the stone is too large or incarcerated, it may lead to damage to the mucous membrane at the stone site, leading to occult blood + in the urine routine. Patients with hematuria, may also be accompanied by severe pain in the lower back and abdomen, dysuria and other manifestations. 3. Urinary system tumor: if the patient only shows urinary occult blood +, but without pain and other discomforts, the patient should also be alert to the possibility of urinary system tumor, including renal pelvis cancer, ureteral cancer, bladder cancer and so on. Urine occult blood + may also have other reasons, so it is suggested that patients should consult regular hospitals in time, improve the examination to clarify the cause of the disease, and give targeted treatment or therapy under the guidance of doctors.