sentence: People can have mild renal failure and have no symptoms.
sentences_before: There are many types of kidney diseases. If kidney disease makes the kidneys not able to do but they do work in part.
sentences_after: Severe' renal failure means 'very' bad failure. The kidneys do not work very much at all. People with severe renal failure 'always' have symptoms.
concept_name: People
headings: Kidney Kidney diseases
categories: Anatomy of the urinary system