Diagnosing telogen effluvium: what to know

Telogen effluvium commonly causes increased shedding from across the scalp rather than a single smooth bald patch. A clinician will ask when you first noticed hair loss and whether a trigger preceded it, such as fever, surgery, major emotional strain, rapid weight change, restrictive eating, childbirth, or a new medicine. The scalp is checked for inflammation, scaling, scarring, broken hairs, and patterned thinning. A gentle hair-pull assessment may be used as one part of the examination.

Blood tests are not automatic for everyone. They may be considered when the history or examination suggests an issue such as iron deficiency, thyroid disease, or another nutritional or hormonal concern. The aim is to separate telogen effluvium from alopecia areata, androgenetic hair loss, scalp disease, or medication-related shedding.

Before an appointment, note the onset of shedding, recent health events, dietary changes, medicines and supplements, family hair patterns, and any scalp symptoms. Bring a list of products and take clear photographs in similar lighting if the change is gradual. Use gentle hair care while the cause is being assessed: avoid tight styles, harsh chemical processing, and vigorous brushing. Treatment focuses first on the trigger when one is found; options such as topical minoxidil or other hair therapies depend on the diagnosis and your clinician’s advice.

Book a dermatology assessment for sudden shedding, clearly defined patches, scalp pain or inflammation, heavy scaling, pustules, eyebrow loss, or thinning that continues or accelerates. Seek earlier care if hair loss follows a new medicine or is accompanied by fatigue, weight change, menstrual changes, or other symptoms. A prompt examination matters when the scalp looks scarred or shiny, because some causes can damage follicles if untreated.

Ask which pattern your examination shows, whether testing is useful, what trigger should be addressed first, and how you will monitor regrowth. Ask before starting supplements, minoxidil, PRP, or another procedure, and clarify what improvement would look like over time.