What could the cause my frequent utis?

Many reasons: 1. Resistance of the bug that lies dormant and revives. 2. Rough sex. 3. Poor immunity. 4. Strange as it may seem a common cause is poor diet---too many calories that induce a relative vitamin deficiency. When cellular energy resources are compromised any organ's function can be impaired.

Low immunity: Lowered immunity can cause frequent UTIs. Taking a zinc supplement 25 mg/day and a good probiotic daily might help solve the problem since they both boost immunity.

Several rsk factors: Recurrent UTI is defined by having more than 3 infections in a year. There are several risk factors such as kidney or bladder stones, frequent sexual intercourse, use of lubricants and spermicides etc.