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What Is Cystitis? Symptoms and Treatment

General Urology · Last updated: 11 November 2026
What Is Cystitis? Symptoms and Treatment
In brief

Cystitis is inflammation of the inner lining of the bladder, usually caused by bacteria, E. coli in particular; it is common in women. The main symptoms are burning when passing urine, frequent urination, cloudy or foul-smelling urine, lower abdominal pain and blood in the urine. Diagnosis is based on the symptoms, an examination and a urine test; treatment usually involves antibiotics.

What Is Cystitis?

Cystitis is the most common type of urinary tract infection and is common in women. It is usually a bacterial infection, although other factors such as irritating substances can also play a part.

Symptoms

  • Pain or burning when passing urine
  • A frequent urge to pass urine (often without passing more urine)
  • Cloudy or foul-smelling urine
  • Pain or discomfort in the lower abdomen or pelvis
  • Blood in the urine

Causes

The bacterium most often responsible is E. coli. Irritating substances such as perfumes or soaps, sex, pregnancy and a weakened immune system can also make cystitis more likely.

Diagnosis

Diagnosis is usually based on the symptoms and an examination. A urine test is done, with a urine culture if needed. In some cases imaging such as ultrasound or computed tomography may be used.

Treatment

Antibiotics are the mainstay of treatment. The medicine is chosen according to how severe the infection is and the result of the urine culture. Painkillers and medicines that make the urine alkaline can be added to ease the symptoms. Probiotics may be recommended before or after antibiotic treatment to protect the gut flora. For more details, see the cystitis treatment page.

To Reduce the Risk

  • Drink plenty of water and go to the toilet regularly.
  • Clean and dry the genital area properly after using the toilet.
  • Pay attention to general and sexual hygiene.

Early diagnosis and appropriate treatment ease the symptoms and help to prevent complications, so see your doctor rather than waiting for it to pass.

Frequently asked questions

Is cystitis sexually transmitted?
Cystitis is not considered a sexually transmitted disease. However, sex can make it easier for bacteria to reach the bladder and so make cystitis more likely.
How many days are antibiotics taken for cystitis?
This depends on the type of infection, your circumstances and the medicine chosen. Even if your symptoms go away, you should take the antibiotic for as long as your doctor advises.
Is cystitis dangerous in pregnancy?
If a urinary tract infection is not treated in pregnancy, it can spread to the kidneys, so it should be taken seriously. Any medicines must be chosen by a doctor.
Why is a urine culture requested for cystitis?
A culture shows which bacterium is causing the infection and which antibiotic works against it. It guides the choice of medicine, especially in recurrent cystitis or cystitis that does not respond to treatment.
Does cystitis go away on its own?
Mild symptoms sometimes ease, but bacterial cystitis usually needs treatment. If you develop a fever or pain in your side, see a doctor without delay.