Urinary tract infections are common diseases of the urinary system. The main clinical manifestations include frequent urination, urgent urination, painful urination, hematuria, pus flowing from the urethra, burning sensation in the urethra, itching in the urethra, pain in the small abdomen, back pain, chills and fever. Urinary tract infections are mainly divided into upper urinary tract infections and lower urinary tract infections according to the site of infection. Upper urinary tract infections mainly refer to pyelonephritis and renal tuberculosis. For example, acute pyelonephritis will cause pain in the lower back, along with obvious high fever and chills, and the temperature can reach 39℃ or more, and some patients will also have nausea, vomiting and hematuria. In the case of renal tuberculosis there will be symptoms of back pain, low fever, night sweats, frequent and urgent urination. Lower urinary tract infections, on the other hand, mainly refer to inflammation of the bladder and urethra. For example, the main symptoms of cystitis are frequent urination, urgent urination, painful urination, and in severe cases, bloody urination, small abdominal pain and fever. Urethritis, on the other hand, is characterized by symptoms such as frequent urination, urgent urination, painful urination, pus flowing from the urethra, burning sensation in the urethra, and itching in the urethra. As mentioned above, the symptoms of urinary tract infection may vary depending on the location of the infection and the severity of the condition. If you have the above symptoms, you need to go to the urology department for routine urination and urological ultrasound to make a preliminary diagnosis.