2.2 Hair Growth Cycles and Patterns
Key Takeaways
- Standard barbering textbooks (the Milady/Pivot Point sources HLO cites) give anagen about 2–6 years and about 90 percent of scalp hair, catagen about 2–3 weeks, and telogen about 3–6 months — Oregon does not publish its own growth-timing study.
- Average scalp growth in those same texts is about 1/2 inch per month.
- Terminal hair is long, coarse, and usually pigmented; vellus is short, fine, and usually unpigmented; androgenetic miniaturization converts terminal scalp hair toward a vellus-like shaft over successive cycles.
- Hair stream, whorl, and cowlick are growth-direction patterns that set razor grain and clipper attack.
- Density (hairs per area), texture (strand diameter), porosity (cuticle), and elasticity (cortex) are four different analysis properties — do not mash them into the word thick.
The same 14-question histology block that names structure also names growth. HLO's Barbering Examination Information Bulletin lists growth (and loss) alongside trichology and structure. Oregon does not publish unique follicle-timing studies. The numbers in this section are the standard barbering textbook figures used by Milady and Pivot Point — the sources HLO cites. Treat them as exam numbers, not as a tape measure of every client in Portland.
Why growth cycles matter on the Oregon exams
You are tested on cycles because they explain everyday shop findings: a client who "is going bald overnight" may be shedding telogen club hairs on schedule; a receding hairline may be androgenetic miniaturization, not a failed shampoo; a cowlick will not "train" into a fade if you ignore grain. Growth direction is also a shaving item. Eight shaving questions sit in Barbering Services, and they assume you can read grain.
ORS 690.005(2) lets an Oregon barber cut, style, and shave. It does not let you prescribe medication, diagnose alopecia areata, or promise to reverse pattern loss. You still have to recognize normal cycling versus pattern change so you do not sell a miracle tonic or miss a referral.
The three textbook phases
Each follicle runs its own clock. Neighboring hairs are not in lockstep, which is why a healthy scalp is not bald after a haircut and not fully shed in autumn like some mammals.
Anagen
Anagen is the growing phase. Matrix cells in the bulb divide, keratinize, and lengthen the shaft. On the scalp this typically lasts about 2 to 6 years. At any moment about 90 percent of scalp hairs are in anagen. Anagen length is genetically set and is the main reason one client's hair can reach the mid-back and another's will not pass the collar. Beard, eyebrow, and body follicles have much shorter anagen — that is why a beard does not grow as long as scalp hair even if the man never trims it.
Catagen
Catagen is the brief transitional (involution) phase, typically about 2 to 3 weeks. Mitosis in the matrix stops. The follicle shrinks. The base of the hair keratinizes into a club hair and detaches from the dermal papilla. Only about 1 percent of scalp hairs are in catagen at a time. It is a switch, not a growth period.
Telogen
Telogen is the resting phase, typically about 3 to 6 months in barbering texts (some medical sources say about three months; learn the textbook range HLO's sources use). Roughly 10 percent of scalp hairs rest. The club hair sits in the shortened follicle until a new anagen hair grows in and the club is shed. Losing about 50 to 100 scalp hairs a day can be normal telogen release, especially with shampooing. It is not automatically disease.
A new anagen then begins. That is normal cycling: same follicle, new shaft of similar caliber.
| Phase | Also called | Typical scalp duration (textbook) | Typical share of scalp hair | What the follicle is doing |
|---|---|---|---|---|
| Anagen | Growing | About 2–6 years | About 90% | Matrix dividing; shaft lengthening; melanin being placed in the cortex |
| Catagen | Transition / involution | About 2–3 weeks | About 1% | Growth stops; club forms; lower follicle shrinks |
| Telogen | Resting | About 3–6 months | About 10% | Club hair rests, then sheds as the next anagen starts |
Average growth rate
Standard texts give average scalp growth of about 1/2 inch (1.25 cm) per month, or about 6 inches per year. That is an average, not a promise. Illness, nutrition, medication, and the local anagen clock change it. Oregon HLO has not issued a different official rate. If an item asks for the average, use one-half inch per month.
Terminal versus vellus
Terminal hair is long, coarse, usually pigmented, and often medullated. Scalp hair, beard and mustache hair, eyebrows, eyelashes, and (after puberty) axillary and pubic hair are terminal.
Vellus hair is short, fine, usually unpigmented "peach fuzz." It covers much of the body. Lanugo is the soft fetal hair shed before or shortly after birth — do not call adult peach fuzz lanugo on the exam.
Puberty converts some vellus follicles (beard, chest) to terminal under androgen influence. Androgenetic pattern loss does the reverse on the scalp: terminal follicles miniaturize over successive cycles into short, fine, pale hairs that look vellus. That is not normal cycling. Normal cycling replaces a terminal hair with another terminal hair. Androgenetic change shortens anagen and shrinks the follicle. Oregon barbers observe and style what is present; they do not medicalize it, and they do not pretend a tonic authorized under ORS 690.005(2)(b) is a DHT blocker.
Growth patterns: stream, whorl, cowlick
Hair stream: hair flowing in the same direction because follicles slant the same way.
Whorl: hair that forms a circular pattern, commonly at the crown. A tight crown whorl will halo or hole-out in a skin fade if you take all hair to the same length against the swirl.
Cowlick: a tuft that stands straight up, often at the front hairline. You cut it with the grain and leave a little length, or it springs up after the client puts on a hat.
These patterns are why "clipper set at 1 all over" fails. Grain is also why the first razor strokes on a face shave follow the with-the-grain (running) direction, then across, then against only where the skin will tolerate it. Neck hair often grows up toward the jaw. Shaving that zone against the grain on a coarse, curved follicle is a classic ingrown-hair setup. Read the stream before you lather.
Density, texture, porosity, elasticity — four different tests
Oregon treatments items include hair and scalp analysis. Do not mash four properties into one adjective like "thick."
| Property | What you are measuring | Layer or count involved | Shop consequence |
|---|---|---|---|
| Density | Number of hairs per square inch | Follicle count, not strand size | A dense coarse beard needs more lather and a slower razor. A sparse crown shows scalp at short lengths. Textbook average is on the order of 2,200 hairs per square inch; blondes tend to have more strands, redheads fewer. |
| Texture | Diameter of the individual strand (fine, medium, coarse) | Mostly cortex bulk | Coarse hair and beard hair often have a medulla and take a different clipper attack than fine hair. |
| Porosity | Ability to absorb moisture | Cuticle | High porosity snags and dries; low porosity resists product. |
| Elasticity | Ability to stretch and return | Cortex side bonds | Wet hair with normal elasticity stretches about 50 percent and returns; dry hair about 20 percent (textbook figures). Poor rebound means do not force tension on a razor outline. |
Fine hair can be dense. Coarse hair can be sparse. High porosity can appear in any diameter after sun, heat, or (in a hair-design chair, not yours) chemical service.
Oregon shop scenario
A client in a Eugene licensed facility wants a tight crown fade and a cheek-and-neck shave. At the vertex you find a whorl. You leave extra length in the swirl instead of running a zero into the circle — density there is lower, and a hole would show. The beard stream on the cheeks runs down; the neck stream runs up to the jaw. You steam and lather, then take the first razor pass with the grain on each zone. The client mentions "I'm shedding like crazy." You see a normal-looking scalp and a handful of club hairs in the cape after the shampoo — consistent with ordinary telogen release, not a patch of broken shafts. You do not diagnose. You do not sell a medical cure. You explain that about 90 percent of scalp hair is usually growing (anagen), a daily shed can be normal, and patchy or scarred loss would be a physician referral. Then you finish the fade with the grain of the whorl.
On the Oregon Barbering Examination, the growing phase of a scalp follicle is called anagen and typically lasts about:
Standard barbering textbooks (Milady / Pivot Point — not an Oregon HLO field study) give average scalp-hair growth of about:
A circular growth pattern on the crown that can make a clipper fade look patchy unless the barber works with the grain is a: