Sudden blood in urine without any discomfort in elderly women may be caused by urological tumor, tuberculosis, stones and so on. 1. Urological tumor: such as renal cancer, bleeding is caused by the invasion of cancer cells into renal blood vessels or rupture of tumor growth. In early stage, it mainly manifests as painless blood in urine, which needs to be further examined by CT of urinary system to confirm the diagnosis. 2. Urinary tuberculosis: such as bladder tuberculosis, blood in urine will appear when the toxin produced by tuberculosis bacilli invades the bladder mucosa, which needs to be treated with anti-tuberculosis drugs. Such as isoniazid tablets, which is highly selective for Mycobacterium tuberculosis, strong antibacterial effect, is the first choice of drugs for the treatment of tuberculosis, but may cause loss of appetite, abdominal pain, anemia, liver damage, allergies, etc. Liver abnormalities, psychiatric patients and epileptic patients are prohibited. 3. Urinary stones: such as kidney stones, when kidney stones and renal parenchyma friction or accompanied by infection caused by renal mucous membrane rupture, it is easy to appear blood in the urine, if the stone does not jamming will not appear pain, can choose extracorporeal lithotripsy treatment, need to pay attention to drink more water, more exercise. If an elderly woman suddenly develops blood in the urine without any discomfort, it is recommended to consult a doctor in time for a clear diagnosis and timely treatment.