All statistics for Alopecia Areata
Prevalence/Incidence of Alopecia Areata: Online Medical Books
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Alopecia:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
The most common form of nonscarring alopecia is male-pattern alopecia, which appears to be related to androgen levels and to aging. Genetic predisposition commonly influences the time of onset, degree of baldness, speed with which it spreads, and pattern of hair loss. Women may experience diffuse thinning over the top of the scalp.
Other forms of nonscarring alopecia include:
❑ physiologic alopecia (usually temporary): sudden hair loss in infants, loss of straight hairline in adolescents, and diffuse hair loss after childbirth
❑ alopecia areata (idiopathic form): generally reversible and self-limiting; occurs most frequently in young and middle-age adults of both sexes (See Alopecia areata.)
❑ trichotillomania: compulsive pulling out of one’s own hair; most common in children
❑ traction alopecia: localized areas of hair loss due to chronic use of tight braids (such as cornrows) or other hair styles. This condition may also result in scarring alopecia.
Predisposing factors of nonscarring alopecia also include radiation, many types of drug therapies and drug reactions, bacterial and fungal infections, psoriasis, seborrhea, and endocrine disorders, such as thyroid, parathyroid, and pituitary dysfunctions.
Scarring alopecia causes irreversible hair loss. It may result from physical or chemical trauma and chronic tension on a hair shaft, as occurs in braiding. Diseases that produce alopecia include destructive skin tumors, granulomas, lupus erythematosus, scleroderma, follicular lichen planus, and severe fungal, bacterial, or viral infections, such as kerion, folliculitis, or herpes simplex.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Vitiligo:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Although the cause of vitiligo is unknown, inheritance seems to be a definite etiologic factor because about 30% of patients with vitiligo have family members with the same condition. Other theories implicate enzymatic self-destructing mechanisms, autoimmune mechanisms, and abnormal neurogenic stimuli.
Some link exists between vitiligo and many other disorders that it often accompanies — thyroid dysfunction, pernicious anemia, Addison’s disease, aseptic meningitis, diabetes mellitus, photophobia, hearing defects, alopecia areata, uveitis, chronic mucocutaneous candidiasis, and halo nevi.
The most frequently reported precipitating factor is a stressful physical or psychological event — severe sunburn, surgery, pregnancy, loss of a job, bereavement, or some other source of distress. Chemical agents, such as phenols and catechols, may also cause this condition.
Vitiligo affects about 1% of the population in the United States, usually people between ages 10 and 30, with peak incidence around age 20. It affects men and women equally, but women are more likely to seek treatment.
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Source: Professional Guide to Diseases (Eighth Edition), 2005
Alopecia (Hair Loss):
Alopecia - epidemiology
(The 5-Minute Pediatric Consult)
Alopecia - prevalence
- Tinea capitis occurs in ~3–8% of the US pediatric population. Occurs more commonly in blacks and in females.
- Alopecia areata occurs in 1 in 1,000 people. The lifetime risk of developing alopecia areata is ~2%.
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Source: The 5-Minute Pediatric Consult, 2008
About prevalence and incidence statistics:
The term 'prevalence' of Alopecia Areata usually refers to the estimated population
of people who are managing Alopecia Areata at any given time.
The term 'incidence' of Alopecia Areata refers to the annual diagnosis rate,
or the number of new cases of Alopecia Areata 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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