Renal failure is divided into acute renal failure and chronic renal failure, and the symptoms of the two are different. Acute renal failure symptoms include decreased urine output, progressive azotemia, etc. Chronic renal failure symptoms include gastrointestinal symptoms such as nausea and vomiting, water and electrolyte disorders, anemia, shortness of breath, etc. 1. Acute renal failure: acute renal failure is a group of clinical syndromes characterized by a short period of time (from a few hours to a few days) in which the renal function decreases, i.e., the solute removal ability and glomerular filtration rate decrease, which leads to the disturbance of the water, electrolyte, and acid-base balance and the accumulation of nitrogen metabolites. Acute renal failure is mainly characterized by decreased urine output, progressive azotemia (nausea, vomiting, headache, irritability, lethargy, weakness, blurred consciousness, etc.), and disorders of water, electrolyte and acid-base balance (heart failure, hyperkalemia, metabolic acidosis, etc.). 2. Chronic renal failure: gastrointestinal symptoms, digestive system symptoms are usually the earliest manifestation of chronic renal failure, the main manifestations of lack of appetite, nausea, vomiting, the mouth has a taste of urine; chronic renal failure is often characterized by a variety of electrolyte metabolism disorders and acid-base balance imbalance, of which metabolic acidosis and water and sodium balance disorders are the most common. Chronic renal failure hematologic manifestations are mainly renal anemia, bleeding tendency and thrombosis tendency, etc. Shortness of breath, shortness of breath, etc. can occur when there is excess body fluid or acidosis. If the above symptoms occur, it is recommended to consult a doctor in time, and actively treat under the guidance of professional doctors to avoid delaying the condition.