What is the cause of painless urine blood?

The main causes of painless hematuria include kidney contusion, nephritis, urinary stones, etc. The specific analysis is as follows:

1. Kidney contusion

When the patient's waist is impacted by external force, resulting in kidney contusion, resulting in painless hematuria. The patient generally does not feel pain during urination, and the whole process of defecation is characterized by bright red hematuria.

2. Nephritis

If the patient has nephritis, inflammation will cause damage to the glomerular semipermeable membrane, resulting in a large number of red blood cells entering the urine when the blood is filtered in the kidney, resulting in hematuria, but no pain.

3. Urinary stones

If the patient has stones in the urinary system, the stones may lead to mucosal tissue rupture, causing local mucosal lesions bleeding, manifested as painless hematuria.