For normal people, there are generally two kidneys, one on the left and the other on the right, but there are a few exceptions. Some people may have three kidneys, but there is nothing abnormal in their bodies, and there is no discomfort or pain. This situation can also be observed temporarily, or urine routine can be done, and urine routine will increase to see if there is any abnormality. If everything is normal, it will not have much impact on people's health.

Kidney is the kidney, the main excretory organ of human or animal, one on the left and the other on the right. On both sides of the lumbar spine, the left kidney of most people is slightly higher than the right kidney because the solid organ liver on the right side occupies space. It is a dark red solid organ shaped like a broad bean.