having a uti -- especially one that is under appropriate treatment -- would not prevent you from using a hot tub. however since you are having back pain which may or may not be related to your uti you should consult your medical provider to make sure you are on the correct antibiotic. hopefully you had a urine culture taken that would answer that question.
should you avoid a hot tub when you have an uti? . i was diagnosed with a uti a couple of days ago. the day after the diagnosis i felt much better so i went to the gym and worked out. after the work out i went in the hot tub for about 10 minutes. today i have so much lower back pain it woke me up in the middle of the night.