Most people think of cancer and heart disease as separate health problems. But growing research reveals a strong and clinically important link between the two.
Cancer patients face a significantly higher risk of developing Afib. This is largely due to systemic inflammation driven by tumors, chemotherapy side effects, and other cancer treatments that directly affect heart rhythm. On the flip side, people with Afib may also have an increased risk of developing certain cancers. Recognizing this bidirectional relationship helps patients and healthcare providers manage both conditions more effectively, ultimately improving overall health outcomes.
Key Insights
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Inflammation triggered by cancer and treatments such as chemotherapy and radiation can damage heart tissue and alter electrical signaling, raising the likelihood of Afib.
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Both conditions frequently arise from common risk factors—including aging, smoking, obesity, and diabetes—pointing to deeper shared biological mechanisms rather than a chance association.
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Patients living with both cancer and Afib experience higher mortality and complication rates, especially those with esophageal, lung, stomach, or blood cancers.
Why are cancer patients at higher risk of Afib?
At first glance, the connection between cancer and Afib may seem surprising. However, closer examination of the underlying biology reveals an intricate and tightly linked relationship.
One of the main links between cancer and Afib is inflammation.
Systemic inflammation—widespread, long-lasting inflammation in the body—is common in many cancers. It causes ongoing tissue damage, makes cells grow and divide more than usual, and keeps the body in a constant state of repair. This chronic inflammation creates an environment that helps tumors grow and survive, and it can be triggered by things like carcinogens, infections, and stress.
Inflammatory substances in the body can damage DNA and promote tumor growth. These same substances can also affect the heart by causing heart muscle cells (cardiomyocytes) to die and by changing the structure of the atria (atrial remodeling). Together, these changes can disturb the heart’s electrical system and increase the risk of developing Afib.
How cancer treatments can harm the heart
Cancer treatments, including chemotherapy, targeted therapies, and radiation, can directly damage the heart and raise the risk of Afib. These treatments can harm the heart by disturbing how mitochondria (the cell’s “powerhouses”) work, interfering with calcium balance, causing scarring (fibrosis), and increasing inflammation in the heart. Over time, these effects weaken the heart’s structure and function, making abnormal heart rhythms like Afib more likely.
Overlapping risk factors
Cancer and Afib share several common risk factors, such as older age, smoking, diabetes, alcohol use, and obesity. Because of this overlap, it makes sense that the two conditions often occur together. The biological processes that link Afib and cancer suggest their relationship is not just a coincidence but is driven by shared disease pathways.
How does Afib affect cancer prognosis?
The relationship between Afib and cancer goes both ways. A Dutch nationwide study found a strong link between Afib and cancer, with patients who had both conditions experiencing higher mortality rates and more complications. People with esophageal, lung, stomach, multiple myeloma, and lymphoma cancers were at especially high risk of developing Afib. When Afib and cancer occur together, treatment becomes more difficult, can limit therapy choices, and often leads to worse overall outcomes.
How MyAfib can help
As more people are living with both cancer and Afib, it is becoming more important that these conditions are treated together. When they occur at the same time, survival rates are lower, which shows why they should not be managed as separate problems.
People living with both conditions can play a key role by learning about their own risks and taking steps to prevent complications. Cancer patients should pay close attention to their heart health, and people with Afib should be aware that their risk of cancer may be higher. Treatment plans work best when they are personalized—adapted to each person’s age, risk factors, type of cancer, and heart condition.
That’s where self-management and regular tracking can make a real difference. By keeping an eye on symptoms, heart rhythm, triggers, and how you respond to treatments, you can notice changes earlier and work more closely with your healthcare team. MyAfib helps you record episodes, treatment journeys, lifestyle habits, and overall well-being over time. This kind of structured tracking not only helps you stay engaged in your own care, but can also lead to quicker treatment adjustments and better outcomes for others living with both cancer and Afib.
