The average person has two kidneys, located on each side of the waist, sharing the role of urine production and detoxification. When one kidney works less, it can be compensated by the other one increasing its work to maintain the overall work unaffected and normal kidney function. Some people, for some reasons, lose one kidney. For example, kidney trauma, kidney tumor, kidney tuberculosis, severe hydronephrosis loss of function, etc. During treatment, the affected kidney is removed and only one kidney is left, also called isolated kidney. Should this condition matter? After one side of the kidney is removed, the remaining kidney usually increases in size compensatively because it has to take up the work of two kidneys in normal people, and after a period of time the kidney is larger and more vascular than normal kidneys. The isolated kidney can completely maintain normal kidney function if it works normally. Therefore, there is no need to worry. You need to be a little careful in life to protect this kidney. If isolated kidney is diseased, the treatment is risky, once you lose only one kidney, it will lead to uremia and need lifelong dialysis, so you need to plan well.