<s>[INST] Sir,My name is Amit(22 yrs old). I am suffering from back ache for the past two years. I have been using tablets for that. Recently when i went to checkup doctor told me that I have only one kidney after doing ultrasound and ct scan tests. And he also mentioned that the one and only kidney that I have is big in size.Is it possible? How many people do generally have this? What I have to do now since I am very much depressed? [/INST] Hi,Thanks for writing in.I have seen people with once kidney from birth and leading normal lives. These are incidental findings and when doing routine ultrasound, we come across such patients. Studies show that single kidney is compatible with normal longevity and does not predispose the existing kidney to greater-than-normal risk. There is no need to get depressed. 1 in 1441 people in normal population might be born with single kidney. </s>