Bladder stones

What are bladder stones?

Bladder stones are hardened, rock-like mineral deposits that form inside your bladder. They usually develop when you cannot empty your bladder completely, leaving stagnant urine behind. Over time, the minerals left sitting in that leftover urine clump together and crystallize into stones.

Bladder stones are classified by their composition:

• Calcium stones: the most common type. They form from the same everyday minerals that cause kidney stones.

• Struvite stones: caused by chronic urinary tract infections (UTIs). Certain bacteria alter your urine's chemistry, allowing these stones to grow surprisingly fast.

• Uric acid stones: triggered by high uric acid levels in the body, which is often tied to conditions like gout or a diet high in purines (like red meat).

• Cystine stones: a very rare type caused by a hereditary genetic condition that leaks specific amino acids into the urine.

Bladder stones are also classified by origin: primary stones form within the bladder itself, usually from urinary stasis, while secondary stones originate in the kidney or ureter and pass down into the bladder, where they may grow further.

Symptoms of bladder stones

Bladder stone symptoms reflect irritation of the bladder lining and obstruction of urine flow. Common signs include:

• Lower abdominal or suprapubic pain, often changing with movement or position as the stone shifts within the bladder

• Pain radiating to the penis, scrotum, or perineum, particularly during urination

• Frequent and urgent need to urinate

• A weak, interrupted, or stop-start urine stream from intermittent obstruction of the bladder outlet

• Blood in the urine (haematuria), from stone-related irritation of the bladder lining

• Pain or burning during urination

• Recurrent urinary tract infections from chronic irritation and incomplete bladder emptying

• In complete obstruction: acute urinary retention, a medical emergency requiring prompt catheterisation

What causes bladder stones?

Bladder stones develop when conditions favour mineral precipitation within stagnant urine. Common contributing causes include:

• Bladder outlet obstruction: is the most common underlying cause in men, most frequently from benign prostatic hyperplasia (BPH) causing incomplete bladder emptying and urinary stasis.

• Neurogenic bladder: conditions affecting bladder nerve control, including spinal cord injury, multiple sclerosis, and Parkinson's disease, impair complete bladder emptying and promote stone formation.

• Urinary tract infection: with urease-producing bacteria including Proteus species directly promotes struvite stone formation through altered urine chemistry.

• Indwelling catheters and foreign bodies: provide a surface for mineral deposition and bacterial colonisation, significantly increasing stone risk with prolonged use.

• Bladder diverticulum: creates a pocket of stagnant urine that promotes stone formation.

• Dehydration: concentrates urine and promotes mineral crystallisation.

• Recurrent kidney stones: stones forming in the kidney can pass into the bladder and continue to grow if not promptly passed.

• Gout and hyperuricaemia: promote uric acid stone formation within the bladder as well as the kidneys.

How are bladder stones detected?

Bladder stones are detected through pelvic imaging, with blood tests assessing the metabolic conditions most commonly contributing to stone formation and identifying complications.

Pelvic MRI Elfcare’s full body MRI scans your bladder directly. Where it adds real value is in identifying the underlying anatomical cause, such as an enlarged prostate, thickened bladder wall, or bladder diverticula, since a stone found incidentally should always prompt investigation of what's causing it.

Blood tests cannot detect bladder stones directly but identify the metabolic and infective conditions most commonly contributing to their formation. Relevant markers in Elfcare's panel include:

• Uric acid elevated in gout and hyperuricaemia, both established causes of uric acid stone formation in the bladder and kidneys

• Calcium and albumin-corrected calcium hypercalcemia from hyperparathyroidism or other causes promotes calcium-based stone formation throughout the urinary tract

• CRP and full blood count elevated CRP and white cell count support active urinary tract infection, relevant both as a cause and a consequence of bladder stones

• Creatinine and eGFR assess kidney function, relevant when chronic obstruction or recurrent infection has affected renal health

• Total PSA in men, prostate enlargement is the most common underlying cause of bladder outlet obstruction leading to stone formation, making PSA assessment relevant to the broader clinical picture

• HbA1c and glucose diabetes impairs immune function and bladder emptying through autonomic neuropathy, predisposing to both infection and stasis

Why early detection matters

Bladder stones rarely occur in isolation, and identifying one should always prompt investigation of the underlying cause, most commonly bladder outlet obstruction from prostate enlargement. Treating the stone without addressing the underlying obstruction leads to recurrence. Left untreated, bladder stones cause recurrent urinary tract infections, progressive bladder wall damage from chronic irritation and inflammation, and in long-standing cases an increased risk of bladder cancer, particularly squamous cell carcinoma, from chronic mucosal irritation. Identifying and treating both the stone and its underlying cause early prevents this cascade of complications and protects long-term urinary tract health.

How Elfcare can help

Elfcare's full body MRI covers the pelvis as standard, directly imaging the bladder and identifying the underlying anatomical factors contributing to bladder stones formation, including prostate enlargement, bladder diverticula, and bladder wall changes from chronic obstruction. This combined assessment is particularly valuable as bladder stones are rarely an isolated finding and almost always signal an underlying condition requiring its own evaluation.

Our blood panel covers uric acid, calcium, CRP, kidney function, and PSA, identifying the metabolic and structural conditions most commonly driving bladder stone formation.

If our MRI or blood tests identify bladder stones or related findings, we take care of further diagnostics or refer you to the appropriate specialist.