Urine test for occult blood (++) suggests the presence of bleeding in the urine, but there are more reasons for bleeding, and further imaging or other tests are needed to clarify the specific cause of bleeding: First, when suffering from acute cystitis or urethritis and other diseases, there can be mucosal filling and edema, accompanied by the manifestation of bleeding. This increases the number of red blood cells in the urine, which will be manifested as occult blood (+), and this condition is usually accompanied by symptoms of frequent urination, urinary urgency or painful urination. Second, the presence of stones in the urinary system, such as ureteral stones, kidney stones, etc., can cause the mucosa of the urinary tract to be damaged by stones, resulting in bleeding, which will appear in the urine test occult blood (++), usually accompanied by pain in the area where the stones are located, such as back pain or abdominal pain symptoms. Thirdly, when there is a tumor in the urinary tract, the tumor itself necrosis and bleeding or cause bleeding of the surrounding mucous membrane destruction, can appear the number of red blood cells in the urine increase, manifested as occult blood (++++), need to carry out CT and other tests of the urinary system to further clarify. Usually the patients are of advanced age and may have chronic pain in the area where the tumor is located.