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The hair growth cycle

One follicle through anagen, catagen, telogen and exogen, with the published duration of each phase and the share of scalp hair sitting in each at any one moment. Shedding is the end of a cycle, not a failure of one.

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The hair growth cycle. One follicle through anagen, catagen, telogen and exogen, with the published duration of each phase and the share of scalp hair sitting in each at any one moment.
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Every number printed on this figure, and where it came from

Each quantity the diagram prints, the sentence it was taken from, and the guide that sentence is in. The build refuses to publish if one of these sentences is no longer in the guide it names.

ValueWhat it is, and the sentence behind itSource guide
2-7 yearsAnagen, the growth phase, lasts 2-7 years for scalp hair
“Duration: 2-7 years for scalp hair”		Telogen Effluvium: Causes and Recovery Timeline
85%Share of scalp hair in anagen at any one moment
“About 85% of scalp hair is normally in anagen”		Telogen Effluvium: Causes and Recovery Timeline
2-3 weeksCatagen, the transition phase, lasts 2-3 weeks
“Duration: 2-3 weeks”		Telogen Effluvium: Causes and Recovery Timeline
about 3-4 monthsTelogen, the resting phase, lasts about 3-4 months
“Duration: About 3-4 months”		Telogen Effluvium: Causes and Recovery Timeline
15%Share of scalp hair in telogen at any one moment
“About 15% of scalp hair is normally in telogen”		Telogen Effluvium: Causes and Recovery Timeline
50-100 hairs a dayNormal daily shedding
“You typically shed 50-100 hairs daily as part of normal cycling”		Telogen Effluvium: Causes and Recovery Timeline
25-50%Share of hair in telogen during telogen effluvium
“during TE, this can rise to 25-50% or higher”		Telogen Effluvium: Causes and Recovery Timeline
What is behind the drawing (9 entries)

Shapes carry claims as much as printed numbers do, and some quantities shape the drawing without appearing in it. Each entry below names the sentence that justifies it.

Drawn asThe decision, and the sentence behind itSource guide
shaft lengthensWhat happens during anagen
“Active growth phase when hair shaft lengthens”		Telogen Effluvium: Causes and Recovery Timeline
shrinks and detachesWhat happens during catagen
“Hair follicle shrinks and detaches from blood supply”		Telogen Effluvium: Causes and Recovery Timeline
very briefCatagen is the shortest phase, and no share is published for it here
“Very brief transitional period”		Telogen Effluvium: Causes and Recovery Timeline
dormant, still attachedWhat happens during telogen
“Hair is dormant but remains attached”		Telogen Effluvium: Causes and Recovery Timeline
ongoingExogen, the shedding phase, is ongoing rather than timed
“| Shedding | Exogen | Ongoing | Old hair falls out |”		How Long Until Hair Loss Treatment Works? The Complete Timeline
pushed out by the new hairHow a hair actually leaves the scalp
“At end of telogen, hair sheds as new anagen hair pushes it out”		Telogen Effluvium: Causes and Recovery Timeline
anagen shortensHow pattern hair loss changes the cycle: growth phase
“**Shortened anagen (growth) phase**: Hair grows for shorter periods”		Androgenetic Alopecia: Complete Guide
telogen lengthensHow pattern hair loss changes the cycle: resting phase
“**Prolonged telogen (resting) phase**: More time between growth cycles”		Androgenetic Alopecia: Complete Guide
each cycle produces a finer hairHow pattern hair loss changes the cycle: hair calibre
“**Follicle miniaturization**: Each cycle produces smaller, thinner hair”		Androgenetic Alopecia: Complete Guide

Where this figure appears

Androgenetic Alopecia: Complete Guide · Telogen Effluvium: Causes and Recovery Timeline · How Long Until Hair Loss Treatment Works? The Complete Timeline

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