Lumbago and occult blood in urine may be caused by urinary stones, pyelonephritis, kidney tumor and other reasons. 1. Urinary stones: when there is urethral stenosis or bad dietary habits, it may lead to urinary stones. When the mucous membrane and tissues of the urinary system are stimulated by stones, lumbago as well as occult blood in urine may occur. 2. Pyelonephritis: when the kidney area is repeatedly stimulated by inflammation, it may cause pyelonephritis. Under the influence of inflammation, the function of kidney will be abnormal, which may easily cause lumbago and occult blood in urine. 3. Kidney tumor: when the tumor grows, it can destroy the kidney and cause lumbago. Tumor grows continuously, causing blood vessel rupture and bleeding, and hematuria can appear when discharged with urine. It is mostly seen in pain and bleeding after exercise. Lumbago and occult blood in urine may also be caused by other reasons, so it is recommended that patients go to the hospital in time and choose the appropriate method to treat the disease.