Symptoms of pyelonephritis can vary depending on a persons age and may include the following: - fever - vomiting - back, side, and groin pain - chills - nausea - frequent, painful urination Children younger than 2 years old may only have a high fever without symptoms related to the urinary tract. Older people may not have any symptoms related to the urinary tract either; instead, they may exhibit confusion, disordered speech, or hallucinations. 
What are the symptoms of Pyelonephritis: Kidney Infection ?