What causes frequent uti?

Many reasons: There are many reasons that can cause a UTI from hygiene, untreated uti, colonization of bacteria, systemic disease, foreign body, holding urine, unnatural connection between urethra to anus (fistua formation), thong underwear, tb, and others. A frequent UTI may also not be a uti, but interstitial cystitis. You complete tests to rule out the other causes.

Numerous factors: Many women get recurrent utis if they don't empty their bladders after sex. Some women in spite of good toilet hygiene and urinating after sex, they may need prophylaactic Macrodantin (nitrofurantoin) after sex. Poor toilet hygiene, obesity + vaginal trapping of urine after voiding - helped by spreading thic=ghs during urination. Constipation. Using bubblebath. Immunocompromise. Urethral catheterization.