Pyelonephritis is an infection of the pelvis of the kidney as a result of ascending urinary tract infection. If the infection is severe, the term "urosepsis" is used interchangeably. Pyelonephritis is treated with antibiotics. It is also be called pyelitis. Pyelonephritis can be either acute, or chronic. Acute uncomplicated pyelonephritis is the sudden development of kidney inflammation. Chronic pyelonephritis is a long-standing infection that does not go away.
The symptoms are: chills with shaking, severe abdominal pain, back pain, fever, fatigue.