Urinary tract infection is a common disease of the urinary system, which is mainly manifested as frequent urination, urgency of urination, pain in urination, pain in the waist and back, abnormal urine, etc. If not treated in time, it can cause some other inflammation. How is urinary tract infection caused? Urinary tract infection, as its name implies, is a disease caused by urinary tract infection, usually caused by bacteria, and a few patients may be caused by fungal viruses or protozoa. In addition, there are some rare cases of urinary tract infection caused by direct infection or lymphatic infection. Direct infection means that if the kidney is injured or the adjacent organs are infected, bacteria will enter the kidney directly through the wound to cause infection, while lymphatic infection mainly refers to patients with pelvic inflammation, appendicitis, colitis, etc, Bacteria can pass through the lymphatic system to cause urinary tract infection. So urinary tract infection may have the above ways. The elderly, women, children, especially baby girls, and some people who do not pay attention to cleanliness in their lives are prone to urinary tract infections.