Testosterone Levels Linked to Heart Rhythm Risk
New research suggests both abnormally low and high testosterone levels may increase the risk of developing atrial fibrillation.
Updated on Oct. 24, 2026 in Men’s Health
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A study published in the Journal of the Endocrine Society identifies a potential association between testosterone hormone levels and atrial fibrillation. Findings indicate the lowest risk for irregular heart rhythms occurs for men within the middle of the normal hormone range.
Why it matters
Understanding this hormonal balance is critical as clinicians seek to manage heart health while considering testosterone treatments. Atrial fibrillation can lead to significant health complications, including fatigue and dizziness, making the optimization of hormone levels a key area of study.
A study of 4,570 older men followed over a median of 4.4 years found that 286 participants developed atrial fibrillation. The 2023 TRAVERSE trial of 5,246 men reported a 3.5 percent rate of the condition in the testosterone group versus 2.4 percent for the comparison group.
The players
Journal of the Endocrine Society
This peer-reviewed publication focuses on research regarding hormones, metabolic processes, and related endocrine disorders.
TRAVERSE trial
This is a large-scale clinical study that investigated the cardiovascular safety of testosterone replacement therapy in older men.
The details
Researchers suggest that low testosterone might disrupt calcium regulation in heart cells, while high levels may alter potassium currents. While the 2023 TRAVERSE trial identified higher rates of arrhythmia, a 2024 analysis of 106 randomized trials found no statistically significant increase when that specific trial was excluded.
Timeline
2023: The TRAVERSE trial examined testosterone treatment and heart health.
2024: An analysis of 106 randomized trials was conducted.
October 2026: The study was published in the Journal of the Endocrine Society.
The Big Picture
This research follows the precedent set by the Framingham Heart Study, which previously established a correlation between hormone levels and cardiovascular health. It builds upon these historical foundations by using current trial data to refine the understanding of how hormonal variance impacts heart rhythm regulation.
Men considering hormone replacement therapy should discuss the cardiovascular risks and optimal hormonal ranges with their healthcare providers. Maintaining hormone levels within the recommended middle range may be a proactive step in minimizing the risk of developing irregular heart rhythms.
The takeaway
Maintaining hormone levels within the middle of the normal range appears to be the safest strategy for heart health. Patients should monitor for symptoms like dizziness or irregular heartbeats if undergoing hormone therapy.
What happens next
Further clinical trials are expected to investigate whether medical interventions aiming for the middle of the normal hormone range successfully reduce the incidence of heart rhythm problems.
Further reading
Learn more about cardiovascular factors affecting patient wellness in our Men’s Health section.
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Do you trust that your doctor is monitoring the potential long-term side effects of hormone treatments?
