A female client has married recently. A month ago she visited her physician with complaints of burning on urination. She was given a prescription for trimethoprim-sulfamethoxazole (Bactrim) DS bid for 10 days. She was admitted through the emergency room on Saturday evening complaining of flank pain. Her temperature was 104_F. A preliminary urinalysis revealed 31 bacteria along with red and white blood cells in the urine. A preliminary diagnosis of pyelonephritis was made. During a nursing admission assessment, which statement by the client demonstrates a possible cause for pyelonephritis?