What causes bladder stones?

Bladder stones usually form when the bladder cannot empty completely, causing urine to remain inside the bladder and allowing minerals to crystallize. Common causes include enlarged prostate, urethral stricture, nerve-related bladder problems, urinary tract abnormalities, and certain medical devices or foreign materials. Identifying and treating the underlying cause is important to reduce the risk of recurrence.

Bladder stones develop when minerals in concentrated or retained urine form crystals that gradually grow into hard deposits inside the bladder.

1. Enlarged Prostate

Benign prostatic hyperplasia (BPH) is an important cause of bladder stones in older men.

An enlarged prostate can narrow the urinary passage and prevent the bladder from emptying completely. Residual urine can then contribute to stone formation.

2. Urethral Stricture

A urethral stricture is a narrowing of the urethra that can restrict urine flow.

When urine cannot pass freely, some urine may remain in the bladder, increasing the risk of bladder stone formation.

3. Neurogenic Bladder

Conditions affecting the nerves that control the bladder can interfere with normal bladder emptying.

This may result in urinary retention and increase the likelihood of bladder stones.

4. Urinary Tract Abnormalities

Structural abnormalities affecting the urinary system may interfere with normal urine flow or bladder emptying and contribute to stone formation.

5. Bladder Foreign Bodies or Medical Devices

Certain foreign materials or urinary devices can act as a focus for mineral deposits and contribute to stone development in some patients.

6. Concentrated or Retained Urine

When urine remains in the bladder for a prolonged period, minerals can crystallize and gradually form a stone.

This is why conditions that cause incomplete bladder emptying are important risk factors.

Can kidney stones become bladder stones?

A stone that forms in the kidney can travel through the ureter into the bladder.

However, bladder stones can also form directly inside the bladder, particularly when there is an underlying problem with bladder emptying.

Can an enlarged prostate cause bladder stones?

Yes. An enlarged prostate can obstruct urine flow and cause residual urine to remain in the bladder. Over time, this can contribute to bladder stone formation.

Men with both BPH symptoms and bladder stones may therefore need evaluation of the prostate and bladder outlet in addition to stone treatment.

Can bladder stones come back?

Yes. Bladder stones can recur if the underlying cause is not addressed.

For example, simply removing the stone without treating significant urinary obstruction may leave the patient at risk of developing another stone.

When Should I See a Urologist?

A urological evaluation is recommended if you have:

• Difficulty emptying your bladder.
• Weak or interrupted urine flow.
• Blood in the urine.
• Pain or burning during urination.
• Frequent urination.
• Recurrent urinary tract infections.
• A history of bladder stones.
• Symptoms of an enlarged prostate.

SCI International Hospital

At SCI International Hospital, New Delhi, Dr. Gautam Banga, Senior Consultant Urologist and Andrologist, evaluates patients with bladder stones, enlarged prostate, urethral stricture, urinary retention, and other causes of urinary obstruction. Identifying the underlying reason for stone formation is an important part of planning appropriate treatment and reducing recurrence risk.