The main causes of kidney cancer
Kidney cancer develops when cells in the kidney start to grow abnormally, but there is no single cause that applies to everyone. The most common type, renal cell carcinoma, accounts for about 9 out of 10 kidney cancers. Researchers have identified several factors that increase the risk, though having a risk factor does not mean you will develop the disease.
Some people develop kidney cancer without any known risk factors, while others with multiple risk factors never do. This unpredictability is one reason why kidney cancer is often caught late — many people have no symptoms in the early stages, and the disease may be found by accident during imaging for another reason.
Key Takeaways
- Smoking is the strongest preventable risk factor for kidney cancer, roughly doubling the risk in current smokers.
- Obesity, high blood pressure, and chronic kidney disease all increase kidney cancer risk, and these conditions often overlap.
- Some inherited genetic conditions, like von Hippel-Lindau syndrome, carry a much higher lifetime risk of kidney cancer.
- Certain medications and workplace exposures have been linked to kidney cancer, though the absolute risk remains low for most people.
- Age matters — kidney cancer is more common after age 50, but it can occur at any age.
Smoking and kidney cancer risk
Smoking is the strongest modifiable risk factor for kidney cancer. Current smokers have roughly twice the risk of non-smokers, and former smokers retain an elevated risk for years after quitting. The risk increases with the number of cigarettes smoked per day and the total years of smoking.
The exact mechanism is not fully understood, but tobacco smoke contains carcinogens that are filtered through the kidneys and may damage the cells lining the organ. Quitting smoking reduces the risk over time, though it does not return to the level of someone who never smoked.
Weight, blood pressure, and metabolic factors
Obesity increases kidney cancer risk in both men and women. The relationship appears to involve hormonal changes and inflammation that accompany excess weight. High blood pressure is also a risk factor, independent of weight — people treated for hypertension have higher kidney cancer rates than those with normal blood pressure.
Diabetes and chronic kidney disease both raise the risk as well. These conditions often occur together, making it difficult to isolate which factor matters most. What is clear is that metabolic health — weight, blood sugar control, and blood pressure — influences kidney cancer development. Managing these factors through diet, exercise, and medication may lower risk, though no intervention has been proven to prevent kidney cancer entirely.
Inherited genetic conditions
Von Hippel-Lindau syndrome (VHL) is the most common inherited condition linked to kidney cancer. People with VHL have a 70 percent lifetime risk of developing kidney cancer, often at a younger age than sporadic cases. VHL is caused by a mutation in a single gene and is inherited in an autosomal dominant pattern, meaning a parent with the mutation has a 50 percent chance of passing it to each child.
Other inherited syndromes carry elevated kidney cancer risk as well, including hereditary papillary renal carcinoma, Birt-Hogg-Dubé syndrome, and familial renal oncocytoma. Genetic testing is available for people with a strong family history of kidney cancer or those diagnosed at an unusually young age. If you have a family history of kidney cancer, discussing genetic testing with your doctor can help clarify your personal risk.
Medications and occupational exposures
Long-term use of certain pain medications, particularly phenacetin-containing products (now banned in many countries), has been linked to kidney cancer. Some studies suggest that regular use of nonsteroidal anti-inflammatory drugs (NSAIDs) may increase risk slightly, though the evidence is mixed and the absolute risk remains low.
Occupational exposure to specific chemicals — including asbestos, cadmium, and organic solvents — has been associated with kidney cancer in some studies. Workers in certain industries, such as leather tanning, petroleum refining, and metal fabrication, may face higher exposure. The latency period between exposure and cancer development can be decades, making it difficult to establish causation in individual cases.
Age, sex, and other factors
Kidney cancer is more common in men than women, with a ratio of roughly 1.5 to 1. The disease is rare before age 40 and becomes more common with each decade after age 50. This age pattern suggests that kidney cancer results from accumulated cellular damage over time.
Race and ethnicity also play a role. Native Americans, African Americans, and Native Hawaiians have higher kidney cancer rates than white Americans, though the reasons for these differences are not fully understood and likely involve a combination of genetic, socioeconomic, and healthcare access factors. Estrogen use in women has been studied as a potential risk factor, with some research suggesting a slight increase in risk with hormone replacement therapy, though findings are inconsistent.
What does not cause kidney cancer
Several factors that people worry about have not been proven to cause kidney cancer. Drinking coffee or caffeine consumption is not a risk factor. Artificial sweeteners, despite earlier concerns, have not been linked to kidney cancer in humans. Kidney stones and urinary tract infections increase the risk of other urinary cancers but not kidney cancer itself.
Radiation exposure from medical imaging — CT scans, X-rays, and nuclear medicine — carries a small theoretical risk of cancer from the radiation itself, but the benefit of accurate diagnosis typically outweighs this risk. The radiation dose from a single imaging study is generally considered safe.
Frequently Asked Questions
Can kidney cancer run in families?
Yes, but most kidney cancers are not inherited. About 5 to 10 percent of cases are associated with inherited genetic syndromes like von Hippel-Lindau syndrome. If multiple family members have had kidney cancer, especially at younger ages, genetic testing may be worth discussing with your doctor.
Does having one kidney increase my risk?
Having one kidney — whether from birth, donation, or removal — does not increase your risk of developing cancer in the remaining kidney. However, people with one kidney should monitor kidney function and report any blood in the urine or flank pain to their doctor promptly.
If I have high blood pressure, will I definitely get kidney cancer?
No. High blood pressure increases risk, but most people with hypertension never develop kidney cancer. Managing your blood pressure through medication and lifestyle changes is important for many health reasons and may reduce kidney cancer risk, though it is not a may provide.
Does dialysis increase kidney cancer risk?
People on long-term dialysis do have a higher kidney cancer risk than the general population. This is thought to relate to the underlying kidney disease and the dialysis process itself. Regular screening may be recommended for dialysis patients, depending on how long they have been on treatment.
What should I do if I have multiple risk factors?
Talk with your doctor about your specific risk profile. If you smoke, quitting is the single most impactful step. Managing weight, blood pressure, and blood sugar through diet and exercise matters for overall health and may lower kidney cancer risk. If you have a family history of kidney cancer, mention it at your next appointment.