Renal or kidney injuries in children are usually minor. A child's kidney is more likely to be injured than an adult's kidney because there is less protection from the bones and muscle around it.

The most likely cause of renal injuries is motor vehicle crashes. A hard blow to the upper abdomen or back such as from a fall, sports injury or violent act can cause injury to the kidney or bladder as well.

A kidney injury may also result from a gunshot wound or knife wound that tears and cuts the organ. These types of injuries are known as penetrating injuries.