Research

Hormonal

Chronic, high-dose anabolic steroid use in weightlifters causes pathological cardiac hypertrophy, myocardial fibrosis, and increased risk of life-threatening arrhythmias and thrombosis.

If you are using high-dose anabolic steroids for bodybuilding, you are at significant risk for heart failure, blood clots in the heart, and sudden cardiac death due to arrhythmias. These risks are not just theoretical; they are documented in weightlifters. The structural damage to the heart (fibrosis and thickening) may not be fully reversible even after stopping the drugs. Medical monitoring is critical, but cessation is the only way to potentially mitigate further damage.

ModerateSupportsMEDIUM confidence
Pathological cardiovascular manifestations are reported in four male patients, who had taken massive amounts of anabolic steroids while undergoing many years of strength training... All four patients had cardiac hypertrophy... Endomyocardial biopsy revealed increased fibrosis in the myocardium in two of the three cases.
Markku S. Nieminen et al. · European Heart Journal · 1996

Why this rating

Case series of four patients; strong clinical evidence but lacks a control group and large sample size.

Source

Serious cardiovascular side effects of large doses of anabolic steroids in weight lifters

Markku S. Nieminen et al. · European Heart Journal · 1996

DOI 10.1093/oxfordjournals.eurheartj.a014724

case_series · n=4Cited 177×
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DOI resolved against Crossref · corpus check 2026-06-10

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