Answer: Pyelonepheritis is basically the inflammtion of kidney.
There alot of causes of pyelonephritis apart from pegnancy as the most common being the bacterial infection.
Explanation:
Pyelonephritis is the severe infection of the kidneys, which may cause fever and flank tenderness along with nausea,vomiting,burning and frequent mictuaration.
Its main cause is bacterial infection mainly 80% infected by E.coli, other bacteria includes Protues, Staphylococcus,Klebsiella species.
Risk factors include sexual intercourse, previous urinary tract infections, diabetes and structural problems of urinary tract.