Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Get Enough Fiber and Fluid: Hemorrhoidal cushions are normal vascular structures in the anal canal, and symptoms appear when their supporting connective tissue deteriorates and stools are hard to pass. In a meta-analysis of seven randomized trials comparing added dietary fiber with non-fiber controls, fiber reduced the risk of persisting symptoms and bleeding by about 50 percent, although it did not improve prolapse, pain or itching. Beans, lentils, oats, wholegrain bread, fruit and vegetables are the everyday sources, and fiber softens stool better when fluid intake is adequate. Clinics in Colon and Rectal Surgery (PMC)
Keep Toilet Visits Short: NHS self-care guidance for piles is to avoid pushing too hard when passing a stool, to avoid spending more time on the toilet than you need to, and not to ignore the urge to go. Straining and prolonged sitting are thought to contribute by raising pressure on the anal cushions and displacing them downward, though reviewers describe the exact pathophysiology as still poorly understood. Leaving your phone and reading material outside the bathroom is a simple way to keep the visit short. NHS
Stay Physically Active: In a retrospective study of 1,162 people followed for 12 months after hemorrhoid surgery, those who exercised regularly had lower odds of recurrence than those who rarely exercised, an odds ratio of 0.34. In the same cohort, each one point rise in an obstructed defecation score, which captures straining and the sense of incomplete emptying, was associated with a 1.38 times higher recurrence risk. The design was observational and post-surgical, so it cannot show that activity prevents hemorrhoids, but regular movement is also one of the things that keeps bowel habits regular. Frontiers in Surgery (PMC)
Know Where Evidence Is Weak: The familiar story that constipation causes hemorrhoids is not confirmed by every study. In a case-control study of 325 consecutive patients examined by proctoscopy, constipation showed no significant association with hemorrhoids, while self-reported diarrhea (odds ratio 2.1) and obesity (odds ratio 1.7) did. Most of what is known about hemorrhoid risk comes from cross-sectional and case-control data rather than prevention trials, so these are associations rather than demonstrated causes, and no lifestyle change has been shown to reliably prevent hemorrhoids from developing. American Journal of Gastroenterology (PubMed)
Get Rectal Bleeding Checked: Bright red blood on the stool, on toilet paper or in the bowl is a classic internal hemorrhoid symptom, but NIH patient information notes that rectal bleeding may also be a sign of Crohn's disease, ulcerative colitis, or cancer of the colon or rectum. Hemorrhoids are common enough that it is easy to attribute any bleeding to them and stop asking questions. New, persistent or unexplained rectal bleeding is worth describing to a clinician rather than assuming the cause. NIDDK (NIH)
How much of this is genetic?
Genetics explains 15% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Estimated inherited liability. No twin studies exist for hemorrhoidal disease; the only directly measured value is a common-variant (SNP-based) heritability of ~5% (Zheng et al. 2021, Gut, GWAS of 944,133 individuals). Total inherited liability is estimated to be modestly higher, but environmental and mechanical factors dominate.
Background and further reading
Hemorrhoids (piles) are swollen or enlarged vascular cushions in the lower rectum and anus. These cushions are a normal part of anatomy that help maintain continence; hemorrhoidal disease occurs when they become engorged, inflamed, or slide out of place. Symptoms include bright-red bleeding during bowel movements, itching, discomfort, and sometimes a palpable lump. It is one of the most common gastrointestinal complaints, affecting a large share of adults at some point in life, with prevalence rising with age and during pregnancy. Most cases are mild and manageable with diet and lifestyle measures.
Genetic Basis: Hemorrhoidal disease has a modest but real inherited component. It is highly polygenic: in the largest genome-wide study to date, an analysis of 944,133 individuals identified 102 independent associated loci, but the many common variants involved each contribute only a small effect, and the directly measured common-variant (SNP-based) heritability was modest, around 5 percent, with the 102 lead variants together explaining under 1 percent of variance. The loci highlighted biological pathways that make anatomical sense, with genes active in smooth muscle, epithelial and connective-tissue development, blood vessels, and the enteric nervous system. This supports a model in which inherited differences in the structural integrity and tone of the anal cushions and surrounding tissue influence susceptibility, rather than a single major gene. A genetic score therefore reflects the small combined contributions of many common variants.
Environmental Factors: Lifestyle and mechanical factors are the dominant drivers of whether hemorrhoids develop and flare. Chronic constipation and straining at stool, a low-fiber diet, inadequate fluid intake, prolonged sitting (including extended time on the toilet), and heavy lifting all raise intra-abdominal and anal-canal pressure. Pregnancy and childbirth are strong risk periods due to increased pelvic pressure and hormonal effects on veins, and obesity and advancing age also contribute. Increasing dietary fiber and fluids, avoiding prolonged straining, and staying physically active are the most consistently supported preventive measures.
The published research behind your score, and the variants it draws on.
5 published scores from 3 studies
The hemorrhoids score combines 5 polygenic scores drawn from 3 published studies.
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Content updated August 2026.
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