Acute telogen effluvium refers to sudden onset of scalp hair loss occurring 2 to 3 months after a triggering event such as a high fever, surgical trauma, sudden starvation, or hemorrhage. While emotional stress is often linked to this condition, evidence supporting this connection is weak, and there is no indication that the stress of daily life alone can cause widespread hair loss. The primary mechanism behind hair loss is the immediate release of anagen hairs. Patients may notice increased hair loss during brushing, combing, or shampooing, with daily losses ranging from under 100 to over 1,000 strands. If shedding occurs at lower rates and for a short duration, baldness may not be apparent, but higher rates can lead to a diffuse reduction in hair density. Spontaneous and complete regrowth typically occurs within 3 to 6 months unless the triggering event is repeated. Abrupt-onset telogen effluvium is often linked to a specific event or trigger 6 to 16 weeks earlier. In acute telogen effluvium, the hair pull test is positive, with normal club hairs, and there is usually a strong positive presence of telogen hairs at the vertex and the scalp margins.[1]
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Gupta et al. (2024) studied this question.
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