Recurrent urine infections could be due to various reasons. Most common
cause is stones in
kidney which is blocking urine pathway. Other causes are changing sexual partners frequently, pregnancy, diabetes and of course childhood infections. The urine can also be due to retention of urine anywhere in its flow due t obstruction. The obstruction can be due to abnormality of structures since birth, stones or diseases like tumors(unlikely). Females are more prone to urine infections.