Kidney cancer

Last updated: 06 May 2026
Reviewed by: Specialist doctors from the Elfcare quality team

Feeling more tired than usual or noticing vague shifts in your energy? These can be early, subtle signs that your kidneys, the organs responsible for filtering your blood, need attention. Kidney cancer typically develops quietly, often remaining asymptomatic until it reaches an advanced stage.

Because symptoms are rare in the beginning, kidney cancer is most effectively detected through abdominal MRI. In fact, the majority of renal tumors are discovered incidentally during scans for unrelated issues in people who feel perfectly healthy. Elfcare’s full body MRI includes both kidneys as standard, providing a proactive way to identify internal changes long before symptoms appear.

Book your consultation to test your health

What is kidney cancer?

The kidneys are vital organs that filter waste, balance fluids, and regulate hormones for blood pressure and red blood cell production. Kidney cancer occurs when cells in the kidney begin to divide uncontrollably, forming a tumour.

The most common type, renal cell carcinoma (RCC), arises from the cells lining the small tubules of the kidney and accounts for approximately 85% of all kidney cancers. Other types include transitional cell carcinoma (of the renal pelvis) and Wilms tumour (primarily in children).

RCC is clinically significant for two reasons: it rarely causes symptoms until it is locally advanced or has spread, and it is most frequently discovered incidentally during imaging for unrelated issues. This silent progression makes proactive abdominal MRI particularly valuable, as it can detect small, localized tumors when they are most treatable and before they impact systemic health.

Symptoms of kidney cancer

Early kidney cancer typically causes no symptoms. The kidneys are deeply positioned retroperitoneally, giving tumours room to grow before causing discomfort. When symptoms do occur, they typically reflect locally advanced disease:

  • Blood in the urine (haematuria) — often the first sign

  • Persistent lower back or flank pain below the ribs on one side

  • A palpable mass in the abdomen or flank

  • Unexplained fatigue and weight loss

  • Fever not related to infection

  • High blood pressure — some RCC tumours produce renin, driving hypertension

  • Anaemia or, paradoxically, polycythaemia — from abnormal erythropoietin production

What causes kidney cancer?

Kidney cancer develops through a combination of genetic, metabolic, and environmental factors. Contributing causes include:

  • Smoking: tobacco carcinogens directly damage renal DNA and remain the most significant modifiable risk factor.

  • Obesity: excess adipose tissue disrupts hormonal signaling and promotes tumor growth.

  • Hypertension: chronic high blood pressure creates oxidative stress and structural kidney damage.

  • Chronic kidney disease: long-term inflammation and dialysis increase the risk of malignant transformation.

  • Von Hippel-Lindau (VHL) disease: a major hereditary syndrome specifically predisposing individuals to clear cell RCC.

  • Genetic syndromes: hereditary papillary RCC and Birt-Hogg-Dubé syndrome significantly increase tumor predisposition.

  • Long-term NSAID Use: prolonged use of certain pain relievers is linked to chronic renal tubular stress.

Understanding these risks allows for more targeted monitoring, especially for those with high blood pressure or a family history of renal disease.

How is kidney cancer detected?

Detection relies primarily on abdominal imaging, with blood tests providing supporting information about kidney function and systemic effects.

Abdominal MRI: MRI is the most sensitive tool for identifying renal masses, accurately distinguishing between solid tumors and benign cysts. Elfcare’s full body MRI includes both kidneys as standard, frequently detecting silent tumors during routine screening while they are still asymptomatic and most treatable.

Blood tests: Blood tests don’t detect kidney cancer directly but assess renal function and metabolic risk factors. Relevant markers in Elfcare's panel include:

  • Creatinine, cystatin C, and eGFR: comprehensive kidney function assessment; impaired function may indicate significant parenchymal involvement

  • Urea: additional kidney function marker

  • Calcium: hypercalcaemia occurs in RCC through paraneoplastic PTHrP secretion; an important systemic signal

  • Haemoglobin and haematocrit: anaemia from chronic disease or, conversely, polycythaemia from ectopic erythropoietin production

  • CRP: systemic inflammation; elevated in advanced RCC

  • HbA1c and glucose: metabolic health; obesity and diabetes are risk factors for RCC

Why early detection matters

Kidney conditions often develop silently, making early detection the most critical factor for a cure. While localized kidney cancer has a 90% survival rate, this drops below 15% once it spreads. Because most tumors remain asymptomatic until they are advanced, proactive imaging is essential.

Elfcare’s abdominal MRI provides the opportunity to catch silent renal masses incidentally, long before symptoms appear. This early awareness allows you to protect your long term metabolic health and implement small, meaningful changes, like managing blood pressure and hydration, to preserve kidney function while the condition is still highly treatable.

How Elfcare can help

Elfcare's full body MRI images both kidneys as standard, making incidental renal mass detection a routine part of every health check. For a condition that is typically asymptomatic until advanced, this is one of the most clinically compelling arguments for proactive full body imaging. A renal mass identified on Elfcare's MRI at an early, localised stage can be treated curatively — an opportunity that is lost once metastatic spread has occurred.

Our blood panel supports the picture with comprehensive kidney function markers, calcium, haemoglobin, and metabolic markers relevant to RCC risk.

If our MRI or blood tests identify a suspicious finding, we take care of further diagnostics or refer you to the appropriate specialist.

Book a consultation to learn more
Book a consultation to learn more

Summary

Kidney cancer often develops silently, remaining asymptomatic until an advanced stage. Early detection is the most powerful tool for a cure, as localized tumors are highly treatable. Understanding your internal health through proactive screening allows you to catch subtle signals early and maintain your long-term vitality.

Elfcare’s full body MRI includes a direct structural assessment of both kidneys as standard, frequently identifying silent masses incidentally. Our comprehensive blood panel further evaluates kidney function and systemic metabolic markers.

Last updated: 06 May 2026
Reviewed by: Specialist doctors from the quality team at Elfcare

FAQ

  • Kidney cancer occurs when renal cells begin to divide uncontrollably. The most common type, renal cell carcinoma (RCC), typically grows silently before causing symptoms. It is one of the tumours most frequently discovered as an incidental finding on abdominal imaging, making proactive MRI particularly valuable.

  • Blood in the urine, flank pain, a palpable abdominal mass, fatigue, and unexplained weight loss. However, most early kidney cancers cause no symptoms at all, which is why imaging rather than symptom monitoring is the most effective detection strategy.

  • Smoking, obesity, hypertension, chronic kidney disease, and hereditary syndromes, particularly Von Hippel-Lindau disease, are the primary causes. Most cases involve a combination of metabolic and genetic risk factors.

  • Abdominal MRI is the primary detection tool, directly imaging the kidneys and characterising any masses found. Blood tests assess kidney function and systemic effects but cannot detect a renal tumour directly.

  • Yes. Elfcare's full body MRI images both kidneys as standard and can identify renal masses incidentally, often in entirely asymptomatic individuals. Our blood panel covers kidney function and metabolic markers. If a suspicious finding is made, we take care of further diagnostics or refer you to the appropriate specialist.

  • Yes. Localised RCC is highly treatable, partial or radical nephrectomy achieves excellent outcomes for tumours confined to the kidney. Small tumours may be managed with active surveillance or ablative techniques. Advanced or metastatic RCC is treated with targeted therapies and immunotherapy. Early detection is the single most important factor in treatment success.