Renal tuberculosis (TB) is a serious infection that affects the kidneys and is caused by the same bacteria that causes lung TB: 
Symptoms
Blood in urine, flank pain, frequent urination, and painful urination. However, not everyone with renal TB has symptoms. 
Causes
The bacteria can enter the body through a break in the skin or a cut in the nose or mouth. It can also spread from the lungs to the kidneys through the bloodstream or lymphatic system. 
Diagnosis
A doctor can diagnose renal TB based on medical history, clinical signs, and instrumental examinations. They may also search for the bacteria in urine, lung sputum, pleural fluid, or lymph node biopsies. 
Treatment
Different drugs can be used in combination to treat and cure renal TB. 
Complications
Renal TB can lead to end-stage chronic renal failure in about 6% of patients.