Pyelonephritis
Pyelonephritis  is inflammation of the kidney. Bacterial infection is a coomon cause. Inflammation may affect one or both kidneys. Symptoms most often include fever and the side of the body hurting between the ribs and the hips. Other symptoms include nausea, a burning feeling when urinating (peeing), and unusually frequent urination. Complications may include pus around the kidney, sepsis (an infection that is out of control, often of the blood), or kidney failure. This can also happen in pets and other animals.