The vast majority of urinary inflammation is caused by pathogenic microorganisms, most commonly bacteria from the intestinal tract, mainly Gram-negative bacilli, 80% of which may be Escherichia coli, or Klebsiella, as well as Aspergillus and Bacillus pneumoniae. Urine infections are mainly caused by low immunity, such as malnutrition and chronic diseases, which can easily lead to infections. Local obstruction, such as stones, tumors, and prostate enlargement, can lead to poor urinary drainage and infection. There may also be medical factors, such as indwelling catheters, fistulas, and urethral dilatation, which can also lead to urinary tract infections. Urinary tract infections must be treated with plenty of fluids and broad-spectrum antimicrobials.