Omega-3 fatty acids are abundant in fish oil and may improve heart health in various ways. However, some research has found a link between high doses of fish oil and an increased risk of atrial fibrillation (AFib).
Scientists are still studying the link between fish oil and AFib and do not fully understand why this link may exist or who is at most risk. It is essential for people to talk with a medical professional before taking new supplements.
This article details potential links between fish oil supplementation and AFib.
An emerging body of research suggests a correlation between taking fish oil and developing new or worsening AFib.
A 12-year study published in 2024 found that those in the general population who take fish supplements are more likely to develop AFib and have a stroke than those who do not take fish oil supplements. However, the results also found that fish oil supplements aid those with pre-existing heart conditions.
As with most health risk factors, researchers have not found a clear causal link between taking fish oil and developing AFib. Instead, some studies show a correlation between the long-term use of fish oil and the long-term risk of AFib.
The study, however, was observational, meaning researchers may not know certain factors, such as which fish oil supplements were taken and other factors that may affect their heart health. Further studies are necessary on the causal links between AFib and fish oil.
What is AFib?
People with AFib
The same 12-year 2024 study mentioned above found a correlation between fish oil supplementation in those with preexisting AFib and a reduction in stroke risk.
Fish oil is typically beneficial for cardiovascular health. Studies suggest adequate Omega-3 intake may reduce the risk of severe cardiac events and
People who develop AFib or whose symptoms get worse when taking fish oil should stop taking it and contact a healthcare professional.
Some signs of AFib
- an irregular or very fast heartbeat
- a fluttery feeling or thumping in the chest
- feeling weak, confused, or dizzy, along with an irregular heartbeat
- shortness of breath
- fatigue
- leg or stomach swelling
When to call 911
If a person with heart issues experiences chest pain or pressure, they should call 911, as this can be a medical emergency.
AFib is usually a sign of an underlying heart or lung issue.
The key risk factors
- advanced age
- high blood pressure
- congenital heart disease
- increased alcohol consumption
- unmanaged obstructive sleep apnea
- obesity
People with AFib
In some cases, a doctor may recommend cardioversion or ablation, which are medical procedures to treat AFib.
Lifestyle changes, such as eating a healthy diet, managing weight, and exercising more frequently, may reduce overall heart health risks. Stopping tobacco use and avoiding alcohol may also lower one’s risk of AFib episodes.
Cardiologists often recommend fish oil to help manage triglyceride levels and reduce the risk of high blood pressure, heart attacks, and strokes in some people.
However, fish oil is not appropriate for everyone. High doses of fish oil might increase a person’s risk of AFib, especially if they have other risk factors.
People with AFib should avoid supplements that can cause heart arrhythmias, such as energy supplements containing caffeine. High doses of fish oil may also link with an increase in the risk of AFib.
However, the Food and Drug Administration (FDA) does not regulate supplements. it is essential for people to always speak with a doctor before taking them.
Fish oil offers a number of potential heart health benefits. Most notably, it can improve cholesterol levels. For this reason, many cardiologists recommend fish oil or omega-3 fatty acid supplements.
However, some research suggests fish oil may increase the risk of atrial fibrillation (AFib). It is best to speak with a doctor before trying fish oil. People who develop AFib while taking fish oil should stop taking the supplement and talk with their doctor.