Results of the study showed kidney infections in women younger than 50 are linked to frequent sexual intercourse (more than three times per week), having a new sexual partner the previous year, and recent spermicide use. The infections were also linked to having a recent urinary tract infection or having a mother with a history of urinary tract infections.Researchers also found a higher risk for kidney infections among women with a history of incontinence and diabetes.
Thus researchers say more studies need to be done to understand the actual cause of urinary infections in women.