Elderly people who urinate red urine may be due to other diseases such as seminal vesiculitis, kidney stones, glomerulonephritis, or kidney cancer. 1. Vesiculitis: Vesiculitis may be caused by pathogen infection, excessive sexual life, perineal injury, alcoholism and other factors. Patients may have symptoms such as localized perineal distension and pain, ejaculation pain, hematospermia, hematuria, dysuria and other symptoms, which are manifested as red urine. 2. Kidney stones: Kidney stones may be caused by metabolic abnormalities, urinary tract obstruction, drugs, insufficient water intake, urinary tract infection and other factors. Patients may have symptoms such as pain in the lower back and abdomen, hematuria, stone discharge, etc. Patients may have reddish urine when urinating. 3. Glomerulonephritis: The causes of glomerulonephritis include infection, heredity, overexertion, improper diet, tumor, etc. Symptoms are hematuria, proteinuria, edema, high blood pressure, etc., and the patients may have red urine when urinating. 4. Others: red urine of the elderly may also be caused by kidney cancer, penile cancer and other diseases. There are many reasons leading to red urine in the elderly, so it is suggested that patients should go to regular hospitals for relevant examinations to find out the causes of the disease.