Urine occult blood 1+ usually indicates positive urinary occult blood, suggesting that there may be a small number of red blood cells in the urine, which may be related to urine contamination, glomerulonephritis, urethral calculi and other diseases. 1. urine is contaminated: this situation is often seen in menstruating women, if the collection of urine specimens, just menstruation, a small amount of menstrual blood mixed into the urine, may appear urine occult blood 1 +. 2. Glomerulonephritis: Glomerulonephritis and other diseases can also cause hematuria, due to glomerular basement membrane fracture, red blood cells through the fractured basement membrane will be subjected to intravascular pressure squeeze, which can lead to damage to the red blood cells deformation, deformation of red blood cells through the blood vessels overflow, there will be occult blood in the urine 1 + situation. 3. Urethral calculi: 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 mucous membrane of the urethra, which will appear in the urine occult blood 1 + situation. Urine occult blood 1 + may have other reasons, when the patient appears urine occult blood test abnormalities, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to improve the relevant examination, and under the guidance of the doctor standardized treatment.