Male pattern baldness Symptoms

Male pattern baldness Symptoms - definitions In men the age...

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Male pattern baldness Symptoms Men (some women) Increasing age (>25 y/o =10%; >35 y/o=25%,>50 y/o=50%) Positive FHx (father, mother +/- maternal grandfather) Gradual receding of the fronto-temporal region Thinning of the crown (vertex) Risk Factor: Whilte ancestry > Asian ancestry > Black ancestry Causes 1. Dominantly inherited disorder 2. Gradual thinning in the temporal areas of the head which produces the classic M shape of hair loss which gradually extends to the crown (vertex) area of the head o Due to the progressive shortening of the anagen growth phase of the hair cycle. o Dependent on dihydrotestosterone (DHT) this is produced by the conversion of testosterone by the enzyme 5-alpha-reductase o This leads to follicular miniaturisation. Epidemiology The prevalence of pattern hair loss may be as high as 98% and as low as 40%, depending on the study
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Unformatted text preview: definitions. In men, the age of onset usually is between 20 and 25 years, and prevalence and severity of disease increase with age. In general, 30% of white people are affected by age 30 years, 50% by age 50 years and 80% by age 70 years. The global incidence varies among ethnic groups with the greatest incidence in white people, followed by Asians, African Americans and Native Americans. In women, the onset of hair loss is usually before 40 years, and according to published data as many as 13% of premenopausal women have some evidence of pattern hair loss. However, the incidence increases in women around the time of menopause and may affect 70% of women over the age of 65 years. Diagnosis No specific tests Dermatoscopy can look for miniaturised hair follicles Thyroid Function test to exclude dysfunction...
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Male pattern baldness Symptoms - definitions In men the age...

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