Urine routine occult blood 1 + is usually an abnormal situation, suggesting that there may be a small number of red blood cells in the urine, which may be associated with urine contamination, urinary tract infection, stones, nephritis, tumors and other diseases. 1. urine is contaminated: this situation is mostly seen in menstruating women, if the collection of urine specimens, just menstruation, a small amount of menstrual blood mixed into the urine, there may be urine routine examination of urinary occult blood 1 +, this time more than not serious, generally do not need to worry about too much. 2. urinary tract infection: mainly caused by bacterial infection, can appear urinary frequency, urinary urgency, urinary pain, blood in the urine and other phenomena, urine routine often have white blood cells, red blood cells, urine protein and other indicators of abnormality. 3. Urinary stones: if the patient has stones in the ureter and other parts of the ureter, when the urine flushes the stones, resulting in the movement of the stones, the stones may cut through the urethral mucosa, which will appear in the urine occult blood 1 + situation. 4. nephritis: glomerulonephritis and other diseases can also cause hematuria, due to glomerular basement membrane fracture, red blood cells through the fracture of the basement membrane will be subjected to intravascular pressure of the pressure of the squeeze, which can lead to damage to the red blood cells deformation, deformation of red blood cells through the blood vessels overflow, then occurs in the urine occult blood 1 + situation. 5. Tumor: when there are urinary tumors, such as bladder tumors, kidney tumors, etc., which can cause abnormal urinalysis, urine occult blood 1+. Urine routine urine occult blood 1 + may have other reasons, it is recommended that the patient timely to the hospital to identify the cause, follow the doctor’s instructions standardized treatment.