6 Common UTI Symptoms (with Symptom Checker)

Medical review: Dr. Clarisse Bezerra
Family Doctor
March 2022

UTI symptoms can vary significantly from one person to anothe. They can also depend on the region of the urinary system that is affected, which can be the urethra, the bladder or the kidneys.

However, the classic symptoms of a urinary tract infection (UTI) include:

  1. Pain or burning when peeing;
  2. Feeling of pressure in the bladder;
  3. Urinary urgency;
  4. Peeing in small quantities;
  5. Very dark and strong-smelling urine;
  6. Persistent low grade fever (under 38ºC or 100.4ºF).

Generally, urinary tract infections are caused by bacteria from the intestines that reach the urinary system. This explains why UTI's are more frequent in women, since the anus is closer to the urethra than in men. Learn about how UTIs in men present differently.

Online symptom checker 

If you think that you may have a UTI, report your symptoms below:

  1. 1.Pain or burning when peeing
  2. 2.Frequent and sudden urge to urinate in small quantities
  3. 3.Feeling of not being able to empty the bladder
  4. 4.Pressure or discomfort in the bladder area
  5. 5.Cloudy urine or presence of blood in the urine
  6. 6.Persistent low fever (under 38º C or 100.4º F)

Different types of UTI

A UTI can affect different locations in the urinary system. Types of UTIs are as follows: 

1. Urethritis: infection in the urethra 

Urethritis happens when the bacteria causing the UTI only infects the urethra, causing inflammation and symptoms like :

  • Frequent urination;
  • Difficulty peeing;
  • Pain or burning sensation when peeing;
  • Yellow discharge in the urethra.

In these cases it is recommended to see your doctor to start treatment with antibiotics to get rid of the bacteria in the urethra. You should also keep the area clean and dry, and aim to increase your daily water intake.

2. Cystitis: bladder infection 

Bladder infection is a common form of UTI and it happens when the bacteria manages to pass the urethra and get to the bladder, causing:

  • Urgent need to urinate, but in small quantities;
  • Burning with urination;
  • Presence of blood in the urine;
  • Cloudy urine with an intense and unpleasant smell;
  • Abdominal pain or feeling of pressure in the low abdomen;
  • Fever up to 38ºC (100.4ºF).

You should see your doctor as soon as one or more of these symptoms appear so you can start treatment with antibiotics and stop the infection from getting to your kidneys.

If you have back pain, fever over 38 ºC (100.4ºF) or vomiting, you should proceed to the E.R. immediately.

3. Pyelonephritis: kidney infection

Most UTIs affect only the urethra or the bladder, however, in more serious cases, the bacteria can reach the kidneys and cause a serious infection that leads to:

  • Fever over 38.5º C (101.3º F);
  • Strong abdominal pain in the abdomen, back or groin;
  • Pain or burning when urinating;
  • Cloudy urine;
  • Presence of pus or blood in the urine;
  • Frequent need to pee.

In addition, you may also have chills, nausea, vomiting or fatigue. In older adults, this type of infection usually causes confusion even before other symptoms appear.

If you suspect you might have pyelonephritis, proceed to the hospital immediately for diagnosis and treatment with intravenous antibiotics.

Read more about the treatment of UTIs.

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UTI symptoms in babies 

Identifying UTI symptoms in babies can be difficult, as babies and children are unable to communicate what they are feeling. In these cases, however, the most common symptoms are:

  • Fever over 37.5ºC (99.5º F) with no apparent cause;
  • Crying when peeing;
  • Urine with an intense smell;
  • Presence of blood in the diaper;
  • Constant irritability;
  • Loss of appetite.

If these symptoms appear, have the baby assessed by a doctor.  

UTI symptoms during pregnancy 

UTI symptoms in pregnancy are the same as when you are not pregnant. Some pregnant women may discover that they have an infection during a routine urine exam, and not present any symptoms.

UTIs are more common during pregnancy, as the immune system has become weakened, and there is an increase in urine proteins which can lead to increased bacterial growth.  

Treatment for UTIs during pregnancy can be completed wit cephalexin and nitrofurantoin, which are safe for use. 

How to confirm the diagnosis

The diagnosis is confirmed through urine tests. Urine cultures can specifically detect the type of bacteria present in the urine to determine which antibiotic is best for use. 

Diagnostic imaging tests, such as an ultrasound or MRI, can also be requested, especially in case of pyelonephritis.

What causes UTIs 

A UTI is caused by bacteria that enters the urinary system, the most common being: Escherichia coli (about 70% of cases), Staphylococcus saprophyticus, Proteus and Klebsiella species and Enterococcus faecalis. 

How to prevent a UTI 

To prevent a UTI you should:

  • Wash the external genital area with soap and water after sexual intercourse;
  • After urinating and passing stool always clean the genitals starting at the front and going to the back, to avoid E. Coli bacteria getting to the urethra;
  • Empty your bladder every time you pee to avoid residual urine, which increases the probability of getting a UTI;
  • Drink more water, aiming for at least 1.5 liters of clear fluids a day;
  • Ensure your diet is rich in fiber to decrease the time that stool remains in the intestines, which decreases the time the bacteria stays inside the body;
  • Do not apply perfume or cream with any type of chemical to the genital area, since it can irritate the skin and increase the risk of UTIs;
  • Avoid wearing clothes that are too tight and avoid wearing daily pantyliners, so you don't sweat excessively in that area. 

Follow these recommendations daily, especially during pregnancy as there is a higher risk of getting a UTI due to hormonal changes and the increase of weight on the bladder. 

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Edited by Tua Saude editing team in March 2022. Medical review completed by Dr. Clarisse Bezerra - Family Doctor in March 2021.


  • RORIZ-FILHO, Jarbas S. et al. Infecção do trato urinário. Revista da Faculdade de Medicina de Ribeirão Preto. 118-125, 2010
  • FIORAVANTE, Flávia. Tecnologia educacional para a prevenção da infecção urinária na gravidez: estudo descritivo. Tese de Mestrado, 2015. Universidade Federal Fluminense.
Medical review:
Dr. Clarisse Bezerra
Family Doctor
Dr. Bezerra possesses a medical degree and specializes in family medicine. She is licensed to practice under CRM-CE licence #16976.