 [ Symptoms ] possible cause of a severe headache with radiating lower back pain son came home from working out after school on thursday and started running a fever on friday fever has subsided but still has a headache and lower back discomfort that runs down through his rear and into his legs [ Disease ] hi usually urinary tract will give you a high grade fever  usually 102 103 f with associated chills and rigors burning micturition is also associated with infection in your case it seems to be a renal calculus that may be passing along ureter causing blood in urine and the pin drink plenty of fluids take antispasmodics get usg done to see whats wrong thanks