SN instructed that urinary tract infection generally develops when bacteria enter the urinary tract and begin multiplying. The most common urinary tract infections are cystitis, which affects the bladder, and urethritis, which affects the urethra. Urinary tract infections are the second most common type of infection that develop in the body. Symptoms of the infection include burning or pain during urination, an urge to urinate often, pressure in the lower belly, foul-smelling urine, back pain below the ribs, tiredness or shakiness, fever and urine that looks reddish or cloudy. A urinary tract infection is more likely to occur in women than men, and it affects people of all ages.