All statistics for Anorectal disorders
Prevalence/Incidence of Anorectal disorders: Online Medical Books
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for more information about the prevalence and/or incidence of Anorectal disorders.
Hemorrhoids:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Hemorrhoids probably result from increased venous pressure in the hemorrhoidal plexus. Predisposing factors include occupations that require prolonged standing or sitting; straining due to constipation, diarrhea, coughing, sneezing, or vomiting; heart failure; hepatic disease, such as cirrhosis, amebic abscesses, or hepatitis; alcoholism; anorectal infections; loss of muscle tone due to old age, rectal surgery, or episiotomy; anal intercourse; and pregnancy.
Hemorrhoids are more common in whites, in persons of higher socioeconomic classes, and in persons who live in rural areas. However, actual incidence figures are unknown because many patients with hemorrhoids self-medicate.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Anorectal abscess and fistula:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The inflammatory process that leads to abscess may begin with an abrasion or tear in the lining of the anal canal, rectum, or perianal skin and subsequent infection by Escherichia coli, staphylococci, or streptococci. Trauma may result from injections for treatment of internal hemorrhoids, enema-tip abrasions, puncture wounds from ingested eggshells or fish bones, or insertion of foreign objects. Other preexisting lesions include infected anal fissure, infections from the anal crypt through the anal gland, ruptured anal hematoma, prolapsed thrombosed internal hemorrhoids, and septic lesions in the pelvis, such as acute appendicitis, acute salpingitis, and diverticulitis. Systemic illnesses that may cause abscesses include ulcerative colitis and Crohn’s disease. However, many abscesses develop without preexisting lesions.
As the abscess produces more pus, a fistula may form in the soft tissue beneath the muscle fibers of the sphincters (especially the external sphincter), usually extending into the perianal skin. The internal (primary) opening of the abscess or fistula is usually near the anal glands and crypts; the external (secondary) opening, in the perianal skin.
The peak incidence of anorectal abscess occurs in people in their 30s and 40s, but there’s also a high occurrence in infants. Men are affected two to three times more often than women. About 30% of patients have a previous history of abscess.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Anorectal disorders usually refers to the estimated population
of people who are managing Anorectal disorders at any given time.
The term 'incidence' of Anorectal disorders refers to the annual diagnosis rate,
or the number of new cases of Anorectal disorders diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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