More than likely, if you have had a urinary tract infection (UTI), you knew it. The stinging pain with urination is enough to make anyone run to her doctor. A UTI occurs when bacteria from the outside travels up your urethra into your bladder causing an infection. The most common bacteria include e.coli, klebsiella, s. aureus (staph), and the strep family. This bacteria may come from your vaginal area, anal area, or external sources.
Women are probably familiar with the usual "after sex" reason; however other common causes include prolapsed uterus, cystocele in the vagina, diabetes, or catheter use. Typical symptoms are pain with urination, frequency of urination, urgency, feeling pressure in the lower abdomen not relieved with urination, back pain, fever, and blood in the urine. A more severe concern is pyelonephritis, where bacteria travel up into the kidney.
Diagnosis is made on symptom history and urinalysis where ...
https://www.empowher.com/urinary-tract-infection/content/what-urinary-tract-infection