Can a urinary tract infection cause trich? I was treated for a uti 3 weeks ago but it acted like it was coming back so I went back to the doc today. It all started 3 Saturday s ago. I had wore jeans w/o underwear for about 2 hrs and they were ones I had wore the day before. A few hrs later I started itching on the outside like the vaginal opening. I had had a discharge that was thin, kinda white but No oder. I thought i was ovulating, and it had gotten the jeans wet. That next monday i went to the doc cause of the itching thinking yeast infection. So, 3 weeks ago I was also treated for a yeast infeacion. After taking the one pill dose, it seem to come back, so I used 1 day cream cream on this Monday night. It caused a yellow discharge that I basically considered the cream coming out colored because of urin. With the symptoms of the uti seeming to come back I went to the doc today. I still have a itch, less than what it was but still annoying, so I wanted to be looked at. They asked about swabbing, and I agreed thinking to test the vaginal opening to verify the yeast was still there... Yes I know... So I was a little surprised when the took a swab from inside the vagina. So my diagnosis is a severe uti and trich. I ve been in a relationship with the same man for 5 1/2 yrs. Can a uti cause a false positive. He s not the best at oral higene can he pass on a thrush like bacteria during oral sex that would cause a false positive.