Renal cell carcinoma is the most common form of kidney cancer in adults, affecting tens of thousands of people each year. While it often develops silently without early warning signs, advances in medical imaging and treatment have made it more manageable than ever before. Understanding this disease can help patients and their families navigate diagnosis, treatment, and life after cancer with greater confidence.
Understanding Renal Cell Carcinoma
Renal cell carcinoma, often shortened to RCC, develops inside the tiny tubes within your kidneys called tubules. These tubules perform essential work in your body by filtering your blood, directing nutrients and water back into your bloodstream, and sending waste products out through your urine. When abnormal cells begin multiplying out of control inside these tubules, they form what doctors call a tumor or mass. Up to 85 percent of all kidney cancers in adults are renal cell carcinoma, making it by far the most common type of kidney malignancy.[1]
The disease usually begins as a single tumor inside one kidney, though in some cases multiple tumors can develop in one or both kidneys at the same time. RCC can remain confined to the kidney itself, which doctors refer to as localized disease, or it can spread beyond the kidney to other parts of the body, which is called metastatic or advanced disease. The type and extent of spread significantly influences treatment choices and outcomes.[1]
How Common Is Renal Cell Carcinoma?
Healthcare providers diagnose approximately 80,000 new cases of renal cell carcinoma each year in the United States alone. Globally, the number reaches about 400,000 new diagnoses annually, making it a significant health concern worldwide.[1][8]
The disease can affect anyone, but certain patterns emerge when looking at who develops RCC most often. Men face about twice the risk compared to women. Age also plays an important role—most people who develop renal cell carcinoma are between 60 and 80 years old, though it’s worth noting that the average age at diagnosis is around 64 years.[1][2]
Renal cell carcinoma accounts for more than 3 percent of all adult cancers and represents over 90 percent of all malignant kidney tumors. It most commonly appears in people between ages 50 and 70, making it primarily a disease of older adults.[3]
What Causes Renal Cell Carcinoma?
The exact reasons why renal cell carcinoma develops remain unclear to scientists. What they do know is that RCC begins when something goes wrong with the way kidney cells function, particularly in how they grow and divide to create new cells. Instead of growing in a controlled, orderly manner, these cells multiply uncontrollably, eventually forming a tumor.[4]
Scientists have identified connections between RCC and changes in certain genes, particularly those located on chromosome 3. In many cases of clear cell renal carcinoma—the most common subtype—researchers find alterations in a gene called VHL. When this gene doesn’t work properly, it leads to the buildup of certain proteins that stimulate the formation of new blood vessels to feed the growing tumor.[3][5]
About 4 percent of renal cell cancers result from rare hereditary conditions. One such condition is von Hippel-Lindau syndrome, an inherited disorder that increases the risk of developing clear cell renal carcinoma along with tumors and cysts in other organs like the pancreas, brain, and spine. Other hereditary syndromes include hereditary papillary renal carcinoma and Birt-Hogg-Dube syndrome, though these are much less common.[3][5]
Risk Factors for Developing Renal Cell Carcinoma
While scientists cannot pinpoint the exact cause of most renal cell carcinomas, they have identified several factors that increase a person’s chances of developing the disease. It’s important to understand that having one or more risk factors doesn’t mean you will definitely get kidney cancer—many people with risk factors never develop the disease, and some people without any known risk factors still develop it.[4]
Smoking stands out as one of the strongest environmental risk factors for renal cell carcinoma. The more a person smokes, the greater their risk becomes. This applies not just to cigarette smokers but also to people who smoke pipes or cigars. Scientists believe that eliminating tobacco smoking could prevent many cases of kidney cancer.[3][4]
Excess body weight, particularly obesity, represents another major risk factor, especially for women. The higher a person’s body mass index (BMI), the greater their risk of developing RCC. Together with eliminating tobacco use, maintaining a healthy weight could potentially cut the incidence of kidney cancer in half.[1][3]
High blood pressure, also known as hypertension, increases the risk of renal cell carcinoma. People with chronic kidney disease or those who require long-term dialysis treatment also face elevated risk. Chronic infection with hepatitis C virus has been linked to higher rates of kidney cancer as well.[1]
Long-term use of certain pain medications, including over-the-counter options like aspirin, ibuprofen, and acetaminophen, may increase risk when taken regularly over many years. Workplace exposure to certain industrial chemicals, particularly trichloroethylene, has also been associated with kidney cancer development.[3][4]
A family history of renal cell carcinoma increases risk, as does having certain genetic conditions like von Hippel-Lindau disease or hereditary papillary renal cancer. Some people are born with certain kidney abnormalities, such as horseshoe kidney or polycystic kidney disease, which may also elevate their risk.[4]
Recognizing the Symptoms
One of the challenging aspects of renal cell carcinoma is that it often causes no symptoms in its early stages. Many people with small kidney tumors feel completely fine and have no idea anything is wrong. In fact, healthcare providers frequently discover kidney tumors accidentally when patients undergo imaging tests like CT scans or ultrasounds for completely unrelated reasons.[1][2]
When symptoms do appear, they typically relate to how the growing tumor affects nearby tissues and organs. One of the most noticeable signs is blood in the urine, a condition doctors call hematuria. This might make your urine appear pink, red, or cola-colored, though sometimes the blood isn’t visible to the naked eye and only shows up in laboratory testing.[1]
Pain in the flank—the area on the sides of your body between your hips and ribs—is another common symptom. Some people notice a firm lump or mass in their abdomen, lower back, or flank area that they or their doctor can feel during a physical examination. These lumps usually aren’t painful but represent the growing tumor.[1]
General symptoms can include fever that comes and goes without an obvious cause, drenching night sweats, and unexplained weight loss when you’re not trying to lose weight. Many people experience extreme tiredness, a condition called fatigue, which doesn’t improve with rest. Some develop shortness of breath or feel that they can’t catch their breath during normal activities.[1]
In some cases, renal cell carcinoma produces symptoms related to paraneoplastic syndromes, where tumors release hormones or other substances that cause changes throughout the body. These can lead to high blood pressure, high levels of calcium in the blood, or an overproduction of red blood cells. Some men notice swelling of the veins around a testicle, a condition called varicocele.[1]
How Changes Occur in Your Body
Understanding what happens inside your body when renal cell carcinoma develops helps explain why symptoms occur and how treatments work. The disease originates in the cells lining the tubules within your kidneys—structures so tiny that millions of them work together in each kidney to filter your blood.[4]
Normal kidney cells grow, divide, and die in an orderly, controlled way. With renal cell carcinoma, genetic changes cause cells to ignore these normal controls. They keep dividing when they shouldn’t, and they don’t die when they should. This leads to an accumulation of abnormal cells that form a mass or tumor.[4]
Many renal cell carcinomas, particularly clear cell types, involve problems with the VHL gene. When this gene malfunctions, cells accumulate proteins called hypoxia-inducible factors that tell the body it needs more blood vessels. These proteins trigger the production of vascular endothelial growth factor (VEGF) and its receptor. VEGF acts like a signal that promotes the growth of new blood vessels, which then supply the tumor with the nutrients and oxygen it needs to continue growing. This process of creating new blood vessels is called angiogenesis.[5]
As the tumor grows larger, it can push against or invade nearby structures, causing pain or discomfort. If blood vessels within or around the tumor become damaged, blood can leak into the urine. The tumor can also press on blood vessels or interfere with normal kidney function, leading to various complications.[1]
In advanced cases, cancer cells can break away from the original tumor and travel through the bloodstream or lymphatic system to other parts of the body. When these cells establish new tumors in distant organs—most commonly the lungs, bones, liver, or brain—doctors call this metastatic spread. Understanding these biological processes has led to the development of targeted treatments that interfere with tumor growth signals.[5]
Prevention Strategies
While you cannot prevent all cases of renal cell carcinoma, especially those linked to inherited genetic conditions, you can take meaningful steps to reduce your risk. These lifestyle changes benefit your overall health while specifically lowering your chances of developing kidney cancer.[4]
Stopping tobacco use ranks as the single most important preventive action you can take. Tobacco smoking is a leading cause of cancer and cancer deaths, and quitting significantly reduces your risk of renal cell carcinoma as well as many other cancers and health problems. If you currently smoke, talk to your healthcare provider about programs and medications that can help you quit successfully.[4]
Maintaining a healthy weight through balanced nutrition and regular physical activity helps reduce kidney cancer risk. Focus on eating plenty of fruits and vegetables, choosing lean proteins, and limiting processed foods high in sugar and unhealthy fats. Regular exercise—even moderate activities like brisk walking—benefits your overall health and helps maintain a healthy weight.[3]
Managing high blood pressure effectively protects your kidneys and reduces cancer risk. Work with your healthcare provider to keep your blood pressure within healthy ranges through medication if needed, dietary changes like reducing salt intake, regular exercise, stress management, and maintaining a healthy weight. If you have chronic kidney disease, following your treatment plan carefully may help reduce your risk.[1]
Being aware of workplace hazards matters for prevention. If your job involves exposure to chemicals like trichloroethylene or other industrial solvents, follow all safety protocols carefully, use proper protective equipment, and ensure adequate ventilation. Discuss any concerns about chemical exposures with your employer and healthcare provider.[3]
Some research suggests that moderate alcohol consumption, eating a diet rich in fruits and vegetables, and regular consumption of fatty fish may be associated with reduced kidney cancer risk, though more research is needed to confirm these protective effects. Avoiding long-term misuse of pain medications, including over-the-counter options, also makes sense as a preventive measure.[3][4]
