A bruised kidney, also called a kidney contusion, results from a direct impact to the lower back region of the body, according to Sportsinjuryclinic.net. It commonly occurs due to a car accident, fall or physical attack, such as being kicked in the back.
Sportsinjuryclinic.net states that the symptoms of a bruised kidney include instant pain, pain in the lower back area, vomiting, nausea and muscle spasms in the back. A simple kidney contusion usually heals without further complications within a week, and the patient is closely monitored for a few days. A doctor examines the patient and requires an X-ray to find out if there are associated injuries like fractured ribs. MRI and CT scans are also used to check for internal bleeding.
According to MedlinePlus, treatment for a kidney injury includes bed rest for one to two weeks or until bleeding decreases. If kidney failure occurs, treatment for symptoms is needed. Doctors usually recommend dietary restrictions and pain medicines. When necessary, surgery is performed and it includes repairing a fractured or torn kidney, torn blood vessels or torn ureter; removing the entire kidney; or placing a stent. Depending on the injury's cause and severity, a person's kidney can start working properly again after treatment, although kidney failure occurs in some cases.