Chronic Telogen Effluvium: Is It a Distinct Condition? A Systematic Review

    Adam Daunton, Matthew Harries, Rodney Sinclair, Ralf Paus, Antonella Tosti, Andrew G. Messenger
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    TLDR Chronic telogen effluvium may not be a unique condition and could be confused with other types of hair loss.
    The systematic review "Chronic Telogen Effluvium: Is it a Distinct Condition?" analyzed 18 studies involving 1628 cases to understand if chronic telogen effluvium (persistent hair loss in the telogen phase) is a unique disorder. The review found no consistent definition for this condition, and many cases currently classified as chronic telogen effluvium might actually be early female pattern hair loss or secondary telogen effluvium due to an unidentified cause. The studies did not rule out all potential causes of telogen hair shedding, and only three studies conducted follow-ups with patients. All eight studies that performed biopsies reported a normal terminal to vellus hair ratio. The review concluded that some cases might be due to an alteration in the hair cycle or a preoccupation with normal hair shedding in anxious individuals with long hair.
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