| Hemorrhoids | |
|---|---|
| Classification and external resources | |
Schematic demonstrating the anatomy of hemorrhoids |
|
| ICD-10 | I84 |
| ICD-9 | 455 |
| DiseasesDB | 10036 |
| MedlinePlus | 000292 |
| eMedicine | med/2821 emerg/242 |
| MeSH | D006484 |
Hemorrhoids (US English) or haemorrhoids (UK /ˈhɛmərɔɪdz/), are vascular structures in the anal canal which help with stool control.[1][2] They become pathological or piles[3] when swollen or inflamed. In their physiological state they act as a cushion composed of arterio-venous channels and connective tissue that aid the passage of stool. The symptoms of pathological hemorrhoids depend on the type present. Internal hemorrhoids usually present with painless rectal bleeding while external hemorrhoids present with pain in the area of the anus.
Recommended treatment consists of increasing fiber intake, oral fluids to maintain hydration, NSAID analgesics, sitz baths, and rest. Surgery is reserved for those who fail to improve following these measures.[4]
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There are two types of hemorrhoids, external and internal, which are differentiated via their position with respect to the dentate line.[3]
External hemorrhoids are those that occur below the dentate line. They may actually be concealed from view however. Specifically, they are varicosities of the veins draining the territory of the inferior rectal arteries, which are branches of the internal pudendal artery. They are sometimes painful, and often accompanied by swelling and irritation. Itching, although often thought to be a symptom of external hemorrhoids, is more commonly due to skin irritation. The skin irritation may be brought about by the inflammation of the external hemorrhoid which in turn leads to a barely noticeable watery discharge and skin irritation. External hemorrhoids are prone to thrombosis: if the vein ruptures and/or a blood clot develops, the hemorrhoid becomes a thrombosed hemorrhoid.[5]
Internal hemorrhoids are those that occur above the dentate line. Specifically, they are varicosities of veins draining the territory of branches of the superior rectal arteries. As this area lacks pain receptors, internal hemorrhoids are usually not painful and most people are not aware that they have them. Internal hemorrhoids, however, may bleed when irritated. Untreated internal hemorrhoids can lead to two severe forms of hemorrhoids: prolapsed and strangulated hemorrhoids. Prolapsed hemorrhoids are internal hemorrhoids that are so distended that they are pushed outside the anus. If the anal sphincter muscle goes into spasm and traps a prolapsed hemorrhoid outside the anal opening, the supply of blood is cut off, and the hemorrhoid becomes a strangulated hemorrhoid.
Internal hemorrhoids can be further graded by the degree of prolapse.[3][6]
Hemorrhoids usually are present with itching, rectal pain, or rectal bleeding.[2] In most cases, symptoms will resolve within a few days. External hemorrhoids are painful, while internal hemorrhoids usually are not unless they become thrombosed or necrotic.[2][3]
The most common symptom of internal hemorrhoids is bright red blood covering the stool, a condition known as hematochezia, on toilet paper, or in the toilet bowl.[2] They may protrude through the anus. Symptoms of external hemorrhoids include painful swelling or lump around the anus.
A number of factors may lead to the formations of hemorrhoids including irregular bowel habits (constipation or diarrhea), exercise, nutrition (low-fiber diet), increased intra-abdominal pressure (prolonged straining), pregnancy, genetics, absence of valves within the hemorrhoidal veins, and aging.[3]
Other factors that can increase the rectal vein pressure resulting in hemorrhoids include obesity and sitting for long periods of time.[7]
During pregnancy, pressure from the fetus on the abdomen and hormonal changes cause the hemorrhoidal vessels to enlarge. Delivery also leads to increased intra-abdominal pressures.[8][9] Surgical treatment is rarely needed, as symptoms usually resolve post delivery.[3]
Hemorrhoid cushions are a part of normal human anatomy and only become a pathological disease when they experience abnormal changes. There are three cushions present in the normal anal canal.[3]
They are important for continence, contributing to at rest 15–20% of anal closure pressure and act to protect the anal sphincter muscles during the passage of stool.[2]
The best way to prevent hemorrhoids is to keep stools soft so they pass easily, thus decreasing pressure and straining, and to empty bowels as soon as possible after the urge occurs. Exercise, including walking, and increased fiber in the diet help reduce constipation and straining by producing stools that are softer and easier to pass.[10] Spending less time attempting to defecate and avoiding reading while on the toilet have been recommended.[3]
A visual examination of the anus and surrounding area may be able to diagnose external or prolapsed hemorrhoids. A rectal exam may be performed to detect possible rectal tumors, polyps, an enlarged prostate, or abscesses. This examination may not be possible without appropriate sedation due to pain, although most internal hemorrhoids are not present with pain.[3]
Visual confirmation of internal hemorrhoids is via anoscopy or proctoscopy. This device is basically a hollow tube with a light attached at one end that allows one to see the internal hemorrhoids, as well as possible polyps in the rectum.
Many anorectal problems, including fissures, fistulae, abscesses, colorectal cancer, rectal varices and itching have similar symptoms and may be incorrectly referred to as hemorrhoids.[3]
Conservative treatment typically consists of increasing dietary fiber, oral fluids to maintain hydration, non-steroidal anti-inflammatory drugs (NSAID)s, sitz baths, and rest.[3] Increased fiber intake has been shown to improve outcomes,[11] and may be achieved by dietary alterations or the consumption of fiber supplements.[3][11]
While many topical agents and suppositories are available for the treatment of hemorrhoids, there is little evidence to support their use.[3] Steroid containing agents should not be used for more than 14 days as they may cause thinning of the skin.[3] Skin protectants such as petroleum jelly or zinc oxide cream may potentially reduce injury and itching.[12]
A number of surgical techniques may be used if conservative medical management fails. All are associated with some degree of complications including urinary retention, due to the close proximity to the rectum of the nerves that supply the bladder, bleeding, infection, and anal strictures.[3]
Symptomatic hemorrhoids affect at least 50% of the American population at some time during their lives, with around 5% of the population suffering at any given time, and both sexes experiencing the same incidence of the condition.[3][14] They are more common in Caucasians.[15]
First attested in English 1398, the word hemmorrhoid derives from the Old French "emorroides", from Latin "hæmorrhoida -ae",[16] in turn from the Greek "αἱμορροΐς" (haimorrhois), "liable to discharge blood", from "αἷμα" (haima), "blood"[17] + "ῥόος" (rhoos), "stream, flow, current",[18] itself from "ῥέω" (rheo), "to flow, to stream".[19]
Hall-of-Fame baseball player George Brett was famously removed from a game in the 1980 World Series due to hemorrhoid pain. After undergoing minor surgery, Brett returned to play in the next game, quipping "...my problems are all behind me."[20] Brett underwent further hemorrhoid surgery the following spring.[21]
Conservative political commentator Glenn Beck underwent surgery for hemorrhoids, subsequently describing his unpleasant experience in a widely viewed 2008 YouTube video.[22]
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