Causes of Piles: Why Hemorrhoids Develop
Reviewed by Dr. Gaurang Ramesh
MBBS, MS, FSGE, Surgical Gastroenterologist and Integrative & Functional Medicine Practitioner
Arka Anugraha Hospital, JP Nagar, Bangalore
What Causes Piles? Understanding the Real Risk Factors
Piles develop when the veins in and around the anus and lower rectum become swollen due to increased pressure over time. It is rarely one single cause; it is usually a combination of everyday habits and physical changes that build up. Understanding your specific risk factors will not undo existing piles, but it does explain why they happened and what you can realistically change going forward.
This page focuses specifically on causes and prevention. For symptoms, see our piles symptoms and diagnosis page, and for the full overview, visit our complete piles guide.
Chronic Constipation and Straining
The single most common cause of piles is repeated straining during bowel movements, often linked to chronic constipation. According to Mayo Clinic, straining increases pressure on the veins in the lower rectum, causing them to swell over time. If you find yourself regularly pushing hard or sitting on the toilet for long periods waiting for a bowel movement, this pressure is very likely contributing to piles, whether or not you have symptoms yet.
Pregnancy and Childbirth
Pregnancy is a well-recognized cause of piles in women, for two main reasons: the growing uterus puts direct pressure on the veins in the pelvis, and hormonal changes can relax vein walls, making them more prone to swelling. The pushing involved in childbirth adds further strain. Piles that develop during pregnancy often improve after delivery, though some women continue to experience symptoms and should mention this to their doctor at a postnatal visit.
Low-Fiber Diet and Dehydration
A diet low in fiber tends to produce harder, smaller stools that are more difficult to pass, which increases straining and, over time, the risk of piles. Not drinking enough water compounds this problem, since fiber needs adequate fluid to work effectively. This is one of the most modifiable causes of piles, and our dedicated diet and lifestyle page for piles explains exactly which foods help and which make symptoms worse.
Sedentary Lifestyle and Prolonged Sitting
Long periods of sitting, whether at a desk, during a commute, or on the toilet itself, increase pressure on the veins around the anus. A sedentary lifestyle also often goes hand in hand with slower bowel transit, which can worsen constipation. Simple changes like standing breaks during the day and avoiding lingering on the toilet can meaningfully reduce this risk factor.
Obesity and Heavy Lifting
Excess body weight increases pressure on the pelvic and rectal veins in much the same way pregnancy does, which is why obesity is a recognized risk factor for piles. Regular heavy lifting, particularly when done with poor breathing technique that involves straining, has a similar effect. This does not mean occasional lifting is dangerous, but repeated heavy strain without proper form is worth being mindful of if you are prone to piles.
Age-Related and Genetic Factors
As people age, the tissues that support the veins in the rectum and anus can naturally weaken, which is part of why the NIDDK notes that about half of adults over 50 experience piles at some point. There also appears to be a genetic component, since piles can run in families, likely due to inherited differences in vein and connective tissue strength. Age and genetics are not factors you can change, but knowing they apply to you is a reason to be more attentive to the modifiable factors above.
Can Piles Be Prevented?
While you cannot control age or genetics, most other risk factors for piles are within your influence. Mayo Clinic recommends eating more high-fiber foods such as fruits, vegetables, and whole grains, drinking six to eight glasses of water a day, avoiding prolonged straining or sitting on the toilet, and staying physically active. These same steps also help manage existing mild piles and reduce the chance of recurrence after treatment. Our diet and lifestyle guide for piles goes into practical detail on all of this, including specific foods, exercises, and comfort measures.
If you are already noticing symptoms alongside these risk factors, it is worth getting an in-person evaluation rather than waiting to see if things improve on their own, since an accurate diagnosis is the only way to know what stage you are at and what will actually help.
Frequently Asked Questions (FAQ)
Chronic constipation and repeated straining during bowel movements are considered the most common cause, since they steadily increase pressure on the veins around the anus and rectum.
Stress itself does not directly cause piles, but it can contribute indirectly by affecting digestion and bowel habits, which may worsen constipation.
Recurrence usually points to an unaddressed underlying cause, such as ongoing low-fiber eating, insufficient water intake, or prolonged sitting. Our diet and lifestyle page covers how to reduce recurrence risk.
There does appear to be a genetic component to piles, since weaker vein and connective tissue support can run in families, though lifestyle factors still play a major role.
Not every pregnant woman develops piles, but the added pressure from the growing uterus and hormonal changes make pregnancy a recognized risk factor, particularly in the later trimesters.
This content is for informational purposes only and does not replace professional medical advice. Always consult a qualified doctor.
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