A common condition with no approved drug treatment, and a study of nearly half a million people that found a genuinely surprising, causal risk factor: being taller.
Varicose veins are enlarged, twisted veins, most often in the legs, caused by faulty one-way valves that let blood pool instead of flowing back toward the heart. They are common and, notably, have no approved medical therapy -- treatment options are procedural (compression, sclerotherapy, or various forms of vein removal or closure), not pharmacological.
The study behind this page took an unusually data-driven approach: applying machine learning to agnostically search for risk factors across 493,519 UK Biobank participants, tracking 2,441 incident cases with Cox regression. It confirmed several already-known risk factors -- age, sex, obesity, pregnancy, and a history of deep vein thrombosis -- and surfaced a new candidate: height. People in the tallest quarter of the population had a hazard ratio of 1.74 for varicose veins compared with the shortest quarter, even after adjusting for the traditional risk factors.
Because a correlation between height and varicose veins could simply reflect confounding (taller people might differ in other ways that actually drive the risk), the authors also ran a genome-wide association study among 337,536 unrelated individuals of white British ancestry (9,577 cases), finding 30 new genome-wide-significant loci, including rs11121615 near CASZ1, catalogued here. Using Mendelian randomization -- a method that uses genetic variants as a kind of natural experiment to test whether a correlation reflects real causation -- they found real evidence that greater height is causally related to varicose vein risk (odds ratio 1.26), not just associated with it. The identified loci point to pathways in vascular development and skeletal/limb biology, consistent with a real mechanistic link between how the legs and their veins develop.
Varicose veins are diagnosed by physical exam, sometimes with ultrasound to assess the underlying valve function -- not by genotype. There is currently no approved drug treatment; management is compression stockings for symptom relief, and procedural options (sclerotherapy, laser or radiofrequency ablation, or surgical removal) for more significant cases, chosen with a vascular specialist.
Height is a real risk factor, not a destiny. Being tall raises the odds of varicose veins, evidenced here by a genuine causal-inference method, not just a statistical correlation -- but it is one contributor among several well-established ones (age, obesity, pregnancy, prior blood clots), not a guarantee.
What a 23andMe/AncestryDNA export or raw VCF can and can't tell you about Varicose Veins comes down to these specific, well-studied positions — not a diagnosis.
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Varicose Veins. MyGeneLog™. https://www.mygenelog.com/conditions/varicose-veins
This study found real evidence that greater height is causally related to varicose vein risk, using a genetic method (Mendelian randomization) built specifically to distinguish causation from correlation -- not just an association. It is one contributor among several, not a guarantee.
No. There is currently no approved medical therapy. Management is compression stockings for symptoms, and procedural options like sclerotherapy or ablation for more significant cases.
No single variant does. This study found 30 new risk loci; the one catalogued here is a real but modest contributor, not a predictor on its own.
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