DHI Thessaloniki - About Hair Loss


Frequently Asked Questions about Hair Loss

Hair is made up of Keratin – a fibrous structural protein.
Hair also contains natural oils (lipids) and water. These hair “ingredients” are arranged in 3
primary structures: the cuticle (which is the outermost, shingle-like layer); the cortex (the
inside of the hair consisting of bundles of protein filaments); and the medulla (a soft
spongy-like core in the centre of the cortex)
On an average there are over 100,000 hairs on a human scalp.
The growth cycle of hair consists of 3 stages:
Anagen – It is the growing period of a hair follicle that typically lasts about 3 to 5
Catagen – At the end of the growth period, hair follicles prepare themselves for the resting
phase. This stage of the hair growth cycle usually lasts about 1 to 2 weeks.
Telogen – This is the resting period of a hair follicle. It is usually 3 to 4 months in length
and at the end of this period older hairs that have finished their life will fall out and newer
hairs will begin to grow.
The percentage of hair growth in each cycle is:
Telogen: 10 – 15%
Anagen: 85 – 90%
Catagen: < 1%
On an average we shed 100 hairs per day.
By far the most common cause of hair loss in men is “Androgenetic Alopecia”
also referred to as “male pattern hair loss” or “common” baldness.
Androgenic Alopecia is due to the male hormone dihydrotestosterone (DHT)
acting on genetically-susceptible scalp hair follicles that causes them to
become progressively smaller and eventually disappear. This process is called
“miniaturization.” The other causes can be Stress, scalp bacteria, poor nutrition,
hormonal imbalance, injury and high fever (e.g. Malaria)
The various types of Alopecia are:
1. Androgenetic Alopecia
2. Alopecia Areata
3. Traction Alopecia
4. Scarring Alopecia
5. Trichotillomania
6. Triangular Alopecia
7. Telogen Effluvium
8. Loose – Anagen Syndrome
The most common form of hair loss in women, Chronic Telogen Effluvium
(long term diffuse hair loss), is an increase in hair loss and decrease in hair
thickness over a long period of time.
On an average, human hair grows 1/3rd mm per day and 10-15 cm per year.
Hair color is the pigmentation of hair follicles due to two types of melanin:
1. Eumelanin – pigment which gives Black or Brown colour.
2. Pheomelanin – pigment which gives Red colour to the hair.
With the reduction of Eumelanin and Pheomelanin, the melamine that causes
pigmentation in hair, hair turns grey. The loss of melamine causes the hair to turn
Shaving your hair doesn’t increase the thickness or quality of the hair. At first
it looks thick, as at the roots, the hair looks denser. As the length grows, it looks
the same as before.{/slider]{slider=How many hairs grow out of each follicle?}Each follicle can grow many hairs over a lifetime. On average, each grows
a new hair around twenty times.
Hair is strong as a wire of iron. It rips after applying a force equivalent to 60
kg, only after it is stretched for about 70%. A single strand can support 100
grams in weight.
The massive production of the hormone Estrogen during pregnancy puts hair
follicles into their ‘growth phase’. After the birth, the hormonal balance is restored
and the hair follicles go into the ‘loss phase’, causing a large number of hairs to
fall out at once.
The hair quality and growth rate highly depends on the race:
1. African hair grows more slowly and is more fragile than European hair.
2. Asian hair grows the fastest and has the greatest elasticity.
3. African and European people are more prone to balding than Asian people.
The average number of hair follicles per sq. cm. in adults is20 to 30 yrs – 615/cm2
30 to 50 yrs – 485/cm2
80 to 90 yrs – 435/cm2
Thyroid hormones affect the growth of hair.
Androgens (male hormones) play the biggest role in hair growth in males.
Estrogen in males slows hair growth.
The hair shaft increases 0.35 mm/day and approximately 1cm per month.
Vellus hairs, also known as “peach fuzz” in the urban dictionary, are fine,
short, light-colored or translucent, and non-pigmented hairs that develop from
childhood and are found on most areas of the body. Their growth is not, in
contrast to terminal hairs, affected or dictated by hormones. Vellus hairs are
usually no longer than two millimeters, and their follicles are not associated with
sebaceous glands.
No, Both grey and black hair can be transplanted and grow naturally.