Urine occult blood in a 70-year-old man, appearing positive can be caused by a variety of diseases such as urinary system diseases, prostate lesions, blood diseases or tumors. Positive urinary occult blood results refer to the centrifuged precipitated urine microscopic examination of more than three red blood cells per high magnification microscopic field of view, when there is a urinary system diseases such as glomerular diseases, such as glomerulonephritis, there can be a full range of painless microscopic hematuria, positive urinary occult blood. When urinary tract infection occurs, due to pathogenic microbial invasion, resulting in the urinary bladder at the mucosa has congestion and edema, can appear microscopic hematuria, urine occult blood test positive; in addition, urinary system stones can also cause urine occult blood positive. Prostate diseases such as acute prostatitis, when the inflammation spreads to the urethra, the urethral mucosa is congested and edematous, with positive urinary occult blood. Blood system diseases such as leukemia, can be due to blood clotting abnormalities occurring in urine occult blood positive or even hematuria and other symptoms. Positive urinary occult blood in the elderly can also be associated with oncological diseases, it is recommended to seek medical attention in a timely manner, after clarifying the cause of the disease, the cause of the symptomatic treatment, so as not to affect the patient’s life.