What could be the causes of reoccuring urinary tract infections?

Many possible. Leaving bladder full without urinating after sex, bubble-bath +/or tub baths rather than taking showers, thongs +/or non-cotton underwear, sub-optimal toilet hygiene by not wiping front to back or keeping thighs together + trapping urine in vagina with voiding, chronic constipation, menopause, bladder stone/s and poor nutrition.
Urinary stasis. Abnormalities in the urinary tract affecting urine flow are the most frequent causes. Examples are: congenital lesions such as vesicoureteral reflux, ureteropelvic junction obstruction; neurogenic bladder; kidney stone; benign prostate hypertrophy. Sexual activity is an important triggering factor for bladder infection especially in women.

Related Questions

What could be the causes of urinary tract infections in elderly men?

UTI isUnusual in men. The infection usually tracks upwards through the urethra. Causes may include sexual activity, non circumcision with suboptimal hygiene, or unknown. In men however, a UTI may warrant ultrasound to rule out a structural abnormality like a stone since UTI is not common in men like in women. Read more...
Enlarged prostate. Prostatic enlargement can lead to progressive urethral + bladder neck obstruction leading to impaired bladder drainage + various degrees of urinary retention. Also can develop bladder diverticula (outpouchings) from increased voiding pressures in bladder, which do not empty with urination. Retained urine "stagnates" and is fertile ground for utis. Read more...