Why Does a UTI Cause Burning and Frequent Urination?
Understanding why urinary tract infections happen, the symptoms they cause, and how doctors diagnose and treat them
When Urination Suddenly Starts to Burn
Sarah, a 29 year old teacher, sits in the exam room looking uncomfortable. She says she has been running to the bathroom all day, but only small amounts of urine come out each time.
Every trip burns. She has no fever and otherwise feels well, but the constant urgency and discomfort are becoming impossible to ignore.
Some infections announce themselves very clearly.
What the Urinary Tract Actually Does
The urinary tract is the system that removes liquid waste from the body.
It begins with the kidneys, which filter blood and produce urine. That urine then travels through narrow tubes called ureters down into the bladder. The bladder stores urine until it is released through the urethra when you urinate.
Any part of this system can become infected. When bacteria enter and begin multiplying somewhere along this pathway, doctors call it a urinary tract infection.
Why Most UTIs Start in the Bladder
Most urinary tract infections involve the bladder.
This type of infection is called cystitis. The most common bacteria responsible is E. coli, a bacterium normally found in the intestines. Because the urethra sits close to the rectal area, bacteria can sometimes enter the urinary tract and begin growing.
Women experience UTIs more frequently than men because the urethra is shorter and bacteria have a shorter distance to travel to reach the bladder.
The Symptoms Doctors Listen For
UTIs tend to produce a recognizable group of symptoms.
Many patients notice burning with urination, frequent trips to the bathroom, and a strong sense of urgency even when the bladder is nearly empty. Some people may also notice cloudy urine, a strong odor, or small amounts of blood in the urine.
In older adults, symptoms can look different. Instead of burning or discomfort, the first sign of infection may be confusion, weakness, or a sudden change in mental clarity.
When the Infection Travels Upward
Sometimes the infection spreads beyond the bladder.
If bacteria travel upward through the ureters and reach the kidneys, the infection becomes more serious. This condition is called pyelonephritis, or a kidney infection.
Kidney infections often cause fever, chills, nausea, and pain in the back or flank area. These infections may require hospital treatment and intravenous antibiotics.
How Doctors Diagnose a UTI
Diagnosis usually begins with a urine test.
A simple urinalysis can detect signs of infection such as bacteria, white blood cells, and sometimes blood. Doctors may also send a urine culture to identify the specific bacteria responsible.
Treatment typically involves antibiotics taken by mouth. For most uncomplicated bladder infections, symptoms begin improving within a day or two. Drinking fluids and completing the full antibiotic course helps clear the infection completely.
THE BOTTOM LINE
• A urinary tract infection occurs when bacteria enter the urinary system and begin multiplying
• The most common symptoms include burning with urination, frequent urination, and a strong urge to urinate
• Most UTIs are treated with antibiotics, but infections that reach the kidneys may require hospital care
By Dr. Karim Ali. Emergency Physician