Anabolic steroids have become increasingly popular among people looking to build muscle, improve athletic performance, or achieve a certain physical appearance.
Social media platforms are filled with images and videos promoting muscular physiques, and some users may be tempted to use steroids to achieve similar results more quickly.
While anabolic steroids can increase muscle size and strength, doctors have long warned that they come with serious health risks.
Previous studies have linked steroid use to liver damage, hormonal problems, infertility, mood changes, and high blood pressure. Now, new research suggests that steroid use may also significantly increase the risk of a dangerous heart rhythm disorder.
Scientists from the University of Birmingham and research institutions in Germany have discovered evidence that anabolic steroids can contribute to the development of atrial fibrillation, a common but potentially serious heart condition. Their findings were published in The Journal of Physiology.
The research was led by Dr. Laura Sommerfeld from the University Medical Center Hamburg-Eppendorf (UKE Hamburg). The study focused on understanding how anabolic steroids affect the heart, particularly in people who may already have an inherited risk of heart disease.
Anabolic steroids are synthetic versions of testosterone, the primary male sex hormone. Testosterone naturally helps regulate muscle growth, bone strength, and other important functions. However, when people take anabolic steroids, hormone levels can rise far above normal levels.
According to the researchers, these high hormone levels may interfere with the normal function of the heart and increase the risk of dangerous rhythm disturbances.
The study focused on a condition called arrhythmogenic right ventricular cardiomyopathy, commonly known as ARVC. This is a genetic heart disease that affects the structure of heart muscle cells. In people with ARVC, the connections between heart muscle cells can become weakened or damaged.
These cell connections are essential because they allow the heart to beat in a coordinated and efficient manner. When the connections are disrupted, electrical signals may not travel properly through the heart, increasing the risk of abnormal heart rhythms.
ARVC is known to occur more frequently in men and often causes more severe symptoms in male patients. The condition can lead to irregular heartbeats, fainting, heart failure, and in some cases sudden cardiac death.
The researchers found that anabolic steroid use can worsen these underlying problems.
Their experiments showed that just six weeks of steroid exposure was enough to damage important cell-to-cell connections within the heart. The steroids also interfered with structures known as sodium channels.
Sodium channels play a critical role in the heart’s electrical system. They help electrical signals move rapidly through heart tissue so that the heart can contract in a coordinated way. When these channels do not function properly, electrical signals slow down and become disrupted.
The study found that steroid-related damage slowed electrical conduction within the atria, the upper chambers of the heart. This disruption increased the likelihood of atrial fibrillation developing.
Atrial fibrillation is one of the most common heart rhythm disorders worldwide. Instead of beating in a regular and organized pattern, the upper chambers of the heart begin to beat rapidly and irregularly. This can cause symptoms such as palpitations, dizziness, shortness of breath, fatigue, and chest discomfort.
More importantly, atrial fibrillation significantly increases the risk of blood clots forming inside the heart. These clots can travel to the brain and cause a stroke. Long-term atrial fibrillation can also contribute to heart failure and other cardiovascular complications.
Professor Larissa Fabritz, one of the study’s co-authors, explained that elevated testosterone levels appear to worsen diseases such as ARVC. Because some people may carry genetic risk factors without knowing it, steroid use could expose hidden vulnerabilities and trigger serious heart problems.
This finding is particularly concerning because many young people who use anabolic steroids consider themselves healthy. They may focus on improving physical appearance or athletic performance without realizing that steroids can place significant stress on the heart.
The researchers believe their findings should serve as an important warning about the cardiovascular risks associated with steroid misuse. While many people are aware of cosmetic side effects such as acne or hair loss, fewer may understand the potential for life-threatening heart complications.
The study also arrives at a time when anabolic steroid use appears to be growing in some populations. Easy access to information online, social media influences, and the availability of performance-enhancing substances through various sources may contribute to increased use among younger individuals.
The researchers emphasize that substances promoted in fitness communities are not always safe simply because they are widely discussed or easily available. Decisions involving hormones, supplements, or performance-enhancing drugs should always be made with appropriate medical guidance.
Although more research is needed to fully understand all of the mechanisms involved, this study provides strong evidence that anabolic steroids can directly affect the heart’s electrical system and increase the risk of dangerous rhythm disorders.
For anyone considering steroid use, the findings highlight an important reality: building muscle quickly may come at a significant cost. Protecting long-term heart health is far more important than achieving short-term physical goals.
If you care about health, please read studies about the benefits of low-dose lithium supplements, and what we know about egg intake and heart disease.
For more health information, please see recent studies about potatoes and high blood pressure, and results showing 6 best breads for people with heart disease.
The study was published in The Journal of Physiology.
Copyright © 2026 Knowridge Science Report. All rights reserved.
