Haemorrhoids, also called piles, are swollen and inflamed vascular structures associated with the anus and lower rectum. Internal haemorrhoids arise within the anal canal and lower rectal lining, whereas external haemorrhoids develop beneath the skin around the anal opening. The vascular tissue itself is part of normal anorectal anatomy and contributes to continence; haemorrhoidal disease develops when these structures become enlarged, displaced, inflamed or symptomatic.
Internal haemorrhoids are classically associated with painless bright-red rectal bleeding and may prolapse through the anal opening, while external disease may produce a palpable lump, itching, irritation or pain. The terms haemorrhoid and pile therefore describe a clinical condition rather than an entirely abnormal anatomical structure.
Symptoms depend strongly on whether the haemorrhoids are internal or external and whether complications have occurred. Internal haemorrhoids may bleed during or after defecation, with bright-red blood appearing on toilet paper, on the stool surface or in the toilet bowl. Prolapse occurs when internal haemorrhoidal tissue descends through the anal opening; some prolapsed tissue may return spontaneously, whereas more advanced prolapse can remain outside or require manual reduction.
External haemorrhoids can cause itching, irritation, a tender lump and discomfort, particularly when inflamed or thrombosed. A thrombosed external haemorrhoid contains a blood clot and may produce sudden, marked local pain. Not every episode of rectal bleeding or anal discomfort is caused by haemorrhoids, so persistent or unexplained bleeding requires appropriate assessment.
Factors that increase haemorrhoidal symptoms include straining during bowel movements, prolonged sitting on the toilet, constipation, diarrhoea, low dietary fibre intake, pregnancy and age-related weakening of supporting tissues. Repeated increases in pressure within the anorectal region can contribute to enlargement or displacement of the vascular cushions. Excessive rubbing or cleaning can aggravate external symptoms even when the underlying haemorrhoids are not severe.
Pregnancy combines several relevant mechanisms, including increased pelvic pressure, hormonal changes and constipation, explaining why symptoms can become more prominent during pregnancy. Haemorrhoids should not, however, be interpreted simply as the consequence of one bowel movement or one episode of straining; they commonly reflect a combination of tissue susceptibility, bowel habit and mechanical factors.
Diagnosis is usually clinical and begins with a history and examination. Inspection can identify external haemorrhoids, thrombosis, inflammation or other anal abnormalities, while a digital rectal examination may assess the anal canal and rectum. Anoscopy or another examination of the lower bowel can visualise internal haemorrhoids and help distinguish them from other causes of bleeding. The major diagnostic issue is avoiding premature attribution of rectal bleeding to haemorrhoids.
Bright-red blood can also occur with anal fissures, inflammatory bowel disease, diverticular disease, colorectal polyps or colorectal cancer. The significance of bleeding depends on age, associated symptoms, recurrence, bowel-habit changes, anaemia, family history and other clinical circumstances, so haemorrhoids should not be used as an automatic explanation for every episode of rectal blood.
Initial management generally aims to produce soft, easily passed stools and reduce straining. Increasing dietary fibre, maintaining adequate fluid intake and avoiding prolonged toilet sitting can reduce mechanical stress on the anorectal tissues. Laxatives may be used when constipation is contributing, while pharmacy treatments can temporarily reduce itching, discomfort or swelling. Warm baths and cold packs may provide symptomatic relief in appropriate circumstances. Many uncomplicated haemorrhoids improve without invasive treatment, particularly when the underlying bowel habit is corrected. Dietary fibre is important because it increases stool softness and can make bowel movements easier, reducing the need for repeated straining.
Persistent, recurrent or more advanced haemorrhoids can require procedural treatment. Internal haemorrhoids may be treated with techniques such as rubber-band ligation, injection-based treatments or other procedures that reduce their blood supply or fix displaced tissue. Larger, prolapsing or treatment-resistant haemorrhoids may sometimes require surgical haemorrhoidectomy or other operative approaches. The appropriate intervention depends on the anatomical type, severity of prolapse, bleeding, pain and response to conservative treatment. Procedures are directed at haemorrhoidal tissue rather than simply treating constipation, so long-term bowel management remains important after treatment. The distinction between internal and external disease is clinically important because procedures suitable for internal haemorrhoids are not automatically appropriate for external haemorrhoids.
Haemorrhoids can be confused with several other anorectal conditions. Anal fissures are linear tears that typically cause sharp pain during defecation, whereas uncomplicated internal haemorrhoids more characteristically cause painless bright-red bleeding. Perianal abscesses, fistulas, inflammatory bowel disease and colorectal malignancy can also produce symptoms that superficially resemble haemorrhoidal disease. Another misconception is that haemorrhoids are simply enlarged veins; their anatomy includes vascular channels and supporting connective tissue, and disease involves enlargement and displacement of normal anal cushions rather than a straightforward venous-varicosity model. Similarly, the presence of a lump does not automatically establish the diagnosis, because thrombosis, skin tags and other lesions can appear as perianal masses.
Haemorrhoids are common and usually manageable, but their clinical importance depends on symptoms and on whether another disorder has been incorrectly attributed to them. Rectal bleeding should receive appropriate medical consideration, particularly when it is persistent, recurrent, unexplained or accompanied by changes in bowel habit, weight loss, abdominal symptoms or anaemia. Severe systemic symptoms, substantial bleeding or signs of infection require urgent assessment rather than routine self-treatment.
The condition illustrates the importance of distinguishing a common benign explanation from the broader differential diagnosis of anorectal symptoms. Prevention is principally based on maintaining healthy bowel habits, avoiding excessive straining and addressing constipation or diarrhoea, while recurrent disease may require investigation of persistent mechanical or gastrointestinal contributors.
