Patients with uremia may experience hematuria, but not all patients will do so. Uremia refers to a condition where over 90% of the patient's kidney tissue has been damaged. Due to the destruction of kidney tissue, when blood passes through the kidneys, it is indeed possible that red blood cells will leak from the glomeruli into the urine. Therefore, patients with uremia may exhibit signs of hematuria, especially those caused by primary chronic glomerulonephritis. If the uremia is caused by tumors or kidney stones leading to urinary obstruction, this situation can cause bleeding in the ureters or bladder, also resulting in hematuria. However, most patients with uremia have a very low chance of experiencing hematuria because the vast majority of their kidney tissue has been destroyed, even up to 100%, leaving no urine production, and thus no blood in the urine. If an anuric patient exhibits hematuria, the possibility of stones, tumors, or urinary tract infections should be considered.