Hi, welcome to the forum, yes, kidney infection
can be related to the pyelonephritis. Urinary tract infection
can be due to infection
involving any part from kidney to urethra. Infection may be pyelonephritis (involving upper urinary tract), urethritis, uretitis, cystitis (lower urinary tract) etc.
Presence of Anatomic abnormalities resulting in obstruction, stasis, or reflux of urinary flow all predisposes towards recurrent urinary infections.