I have a bladder infection (and I'm suspecting it's related to my using Humira because I never had any before in my life). But how does one usually know if the infection has spread to your kidney or not? I did an ultrasound for both my kidney and bladder and the doctor said they both turned out normal. However the urine culture result showed there was infection. Right now I feel very concerned if the infection has spread to my kidney or not. I've been on antibotics for several days but the symptoms are still very strong (namely the feeling of unemtpied bladder and the urgency and frequency of using the restroom and so on). Could anyone give me some idea or suggestions? Thanks a lot!!