Hair growth cycle

The following is a hair different growth stages:


Also known as the active phase of growth, sustainable 4-6 years growing season, or even longer, the hair was active proliferative state, the lower part of the hair bulb cell division to accelerate, the upper part of the hair bulb cell differentiation cortex, hair cuticle; increased dermal papilla speed up cell division, the number increased. The original active melanin grow dendritic suddenly began to form melanocytes.


Also known as atrophy or degradation period of a period of 2-3 weeks. Hair hyperplasia actively stop the formation of clubbing hair eosinophilic homogeneous material, its lower end, around which was a bamboo rod. Inner hair root sheath disappear trichilemmal keratosis gradually, and and flattened hair bulb, not a depression, the dermal papilla narrowing, reduced the number of cells. The push black cells lose dendritic sudden and rounded without activity.

(3) telogen

Also known as quiescent or rest period, a period of about three months. In this phase, the hair follicle is gradually atrophy, a growth phase hair ball is re-formed in the vicinity of the hair follicles has been aging, and finally the old hair loss, but at the same time there will be new hair grow re-enter the growth phase and the repetition period. Scalp 9% -14% of the hair is in the telogen phase, only 1% in catagen, eyebrows, then 90% in telogen.


Hair structure


Hair loss

Types of hair loss and baldness

Appear in the form of hair loss and hair atrophy is irregular, divided into two types:

(1) transient hair loss and baldness; 2) persistent hair loss and atrophy to bald:

(1) transient hair loss and baldness

Characterization is a very short period of sudden massive hair shedding (1-30 days) after the hair loss, scalp becomes very smooth.

Referred to as: (diseases bald) Alopecia areata (receive many); postpartum hair loss; hair loss after chemotherapy, decreased immunity.

(2) continuing to baldness hair loss and atrophy

(Including hereditary oil spills, baldness, hair line shift, sparse hair, hair atrophy, by environmental factors baldness)

Causes: due to the pressure of life lead to endocrine imbalance, nutrient supply hair follicles slowly reduce hair replacement frequent regeneration) (hair loss after hair from the young to change short hair to the invisible head hair (fluff), so dense immature hair coarse hair change hair to bald time is long, ranging from several years to several decades, persistent off the head are the same characterization is the more immature the more bald hair shorter the slowly majority (range) and the process is the same.

1. Alopecia areata, also known as receive many

[Alopecia areata Causes】

Alopecia areata commonly known as "receive many, is a local, the irregular patchy alopecia, often suddenly occur, and whether it is an adult or a child may encounter this problem.

Have a certain relationship with the autoimmune medically. Deviations such as the body's immune system, the body's antibodies to the hair follicles of the head when mistaken for bacteria attacks the hair follicles so that hair follicle cells injured and off.

Telogen effluvium

"The quiescent hair sudden drop" is another phenomenon of hair loss. Occurred because many the hair follicle sudden early into the "quiescent", during which the hair will become thinner overall. The formation of such hair loss for a variety of reasons: when the man was hit by too much pressure, postpartum alopecia

3. "Male pattern baldness" (Male Pattern Hair Loss)

As the name suggests, male pattern baldness is the most common male hair loss. Up to 46 kinds of hair loss causes localized or diffuse hair loss, there are genetic or acquired the influence of external factors, the following is a common reason for some men's hair loss:

The androgen Genetic hair loss (androgenetic alopecia)

"Male pattern baldness" is inherent. With age, the increase in male hormones testicular fat ketone, in fact,, testicular fat ketone itself does not lead to hair, but when combined the testicular fat ketone and called enzyme (5-alpha-reductase) reduction () will produce the hormone dihydro-testosterone (Dihydrotestosterone DHT).


What is DHT?

Dihydrotestosterone Dihydrotestosterone (DHT), a male hormone testosterone (Testosterone) via 5 - Influenza restore enzyme (5-alpha reductase) into. 5 - alpha-reductase (5-alpha reductase) can be divided into type I and type II, type I is located on the skin tissue, including the scalp; type II located in genital tissue.

Of dihydro-testosterone (DHT) shortening the hair growth phase

Hair roots draw nutrients from the blood vessels, including blood cells and testicular hormones (T). 5α Restore enzyme enzyme called role, testosterone (T) into another hormone called dihydro testosterone (DHT). Due to genetic cause of male pattern hair loss men, contains a lot of dihydro-testosterone (DHT) in the scalp, appears.

Impact of DHT

By the studies, the male hormone dihydrotestosterone testosterone (DHT), will shorten the period of growth of the hair, the hair stop growing failed to enter the fully mature stage, as well as mature hair <colored and stout> pubescent <short and succulent baby hair> replace, if it continues, will make the hair follicle atrophy, new hair growth becomes more succulent, can no longer maintain the healthy growth of the hair until the hair follicle, the formation of hair loss.


Clinical manifestations

Most of the ordinary people are beginning to discover the hair line shift, hair loss, thinning the forehead hair root atrophy.

Androgenetic alopecia baldness is very characteristic appearance easily recognizable, formerly also known as a typical alopecia (Pattern alopecia), the site of hair loss are generally on both sides or top of the head from the forehead, hair line shift, forehead Yulai higher on both sides of the forehead began alopecia, most can be diagnosed as male pattern baldness, of course, part of the male pattern baldness, is the start of the first head sparse hair Mediterranean.

Diagnosis of androgenetic alopecia

1. Home genetic male pattern baldness; Family hoistory

2. Typical forehead bald or Mediterranean alopecia; Frontotemporal, Vertex Baldness

3. In the 20-30 age began alopecia;

More than three in two matches likely to be male pattern baldness, and then make the following checks:

Checking items:

1. Baldness patterns began alopecia time, family history;

2. determines the severity of the alopecia, Advances period;

3. Hair root and scalp conditions;

4. Male hormones, thyroid, adrenal check (not required);

Syphilis and other infectious disease screening, checking autoimmune antibodies.

Have been identified androgenetic alopecia, it is necessary as early as possible treatment, alopecia time once the long delay, hair follicles, hair roots are shrinking, even the best medicine can not revive.

4. Seborrheic alopecia

Is seborrheic alopecia characteristics symmetrically: the forehead both sides and top of the head of hair becomes sparse fine.

Corruption substance caused head high because of the male hormones, sebum secretion excessive supposed to be secreted sebum from the pores and accumulate in the hair follicles, and contribute to the propagation of bacteria and parasites, and thus lead to inflammation, attached to the scalp through the pores, so that changes in the hair matrix cells, growing hair becomes Exogen hair and cause hair loss.

Thalassemia hair loss

Thalassemia hair loss is a hereditary disease, such symptoms swallowed the red blood cells, white blood cells of the body and cause anemia, hair follicles are not nutrients provided by blood, and the degradation of hair follicle cells and make the hair loss.

Shedding symptoms of thalassemia alopecia whole head average shedding, unlike alopecia areata partial loss, so that the whole head evenly thin.

Observed by appearances thalassemia hair loss?

1. The patient's hair average rarefied shedding;

2. Patients with skin showing stasis melanin, because patients need regular blood transfusions, blood transfusion fresh anti-rejection drugs, the skin has a stasis black phenomenon.

Women hair loss

Ms. hair loss and men's hair loss is very different, and the distribution of the causes of hair loss and the location of Ms. there are also a lot of, respectively, the following are some common Ms. alopecia:

Pregnancy, childbirth, menopause

Three physiological phenomenon likely to cause female hormonal imbalance and lead to hair loss, such as improper care, and coupled with the psychological burden after childbirth or menopause, will result in long-term hair loss problems.


Life is stressful, women bear the mental pressure is growing, in fact, the modern woman is not only pressure, frequent communication, but also to care for the family, to take care of children under heavy pressure and anxiety, the body of the male hormone, an increase in the secretion of oil glands, scalp oil, coupled with mental stress, will make the bonnet muscle tension, affecting blood circulation, hair loss is inevitable.

Weight loss diet

In today's focus on body era, trendy slimming, general weight loss diet habits, resulting in unbalanced nutrition, enough so that the body of vitamins and nutritional depletion, the body can not absorb adequate and balanced nutrition, healthy hair indirectly not get the required nutrients and become easy to shed. Without rapid treatment, are more likely to lead to severe hair loss.

Often long-term tie the hair (pony tail, bun)

Many women today to aesthetic or operational needs daily long-term Zhaqi hair neat sense of hope to strengthen often pull hard forehead hair, but in the long pull hair will make the hair follicles and the hair shaft pressure, resulting in hair becoming juvenile accelerated shedding, even the forehead and brow hair line backward.

Other reasons

Growing season alopecia Anagen efflvium:

Growth phase of hair loss is the most serious hair loss category, often one does not leave all of the hair fall out, mostly, such as cancer patients undergoing chemotherapy during induced hair loss, but fortunately in this patient stopped after treatment, hair and more able to re-grow back. Many drugs can cause the growth phase of hair loss, such as anticancer drugs: Colchicin will inhibit hair growth, often in medication to see hair loss as soon as one to two weeks, thinning hair shaft and break off.


Serious injury, the bigger surgery or serious illness, will cause hair loss. Usually above happened after 3 months, the patient will begin to hair loss, but another three months alopecia situation will get better.

If you are serious long-term illnesses, such as heart disease or diabetes, may be continued hair loss.


Society's fast pace, fierce competition, and also greatly increase the pressure of work and everyday life. The pressure make hormone secretion severe mental stress and depression can cause hair loss, loss of balance, loss of appetite because patients are usually caused the malnutrition, hormonal imbalance, or nervous pulled away hair, comb your hair rudely. In addition, the emotional stress, anxiety, sustained pressure causes the blood vessels to tighten nutrition can not be extended to the hair root, such as massage head be to help relieve stress.

Habits and customs

Personal habits are not normal, long-term lack of sleep, alcohol, smoking will affect hair follicles healthy. Furthermore, balanced diet, will make the body can not absorb the nutrients it needs. Indirectly cause the hair follicles to nutrient shortage, and the hair thus become succulent, and finally lead to hair loss. , Often wearing a hat or wear a wig, head hot and sweating, scalp vascular oppressed, poor cause blood and nutrients will lead to impede normal hair growth and cause hair loss.

Natural environment

The subtropical climate is hot and humid, the scalp oil secretion strong, easy to plug the hair follicles, affect the health of the scalp and hair; coupled with serious air pollution, the hair loss problem even worse.

Natural hair loss

Human hair growth is cyclical, after growing hair root gradually shrinking buried in the skin where the part is very short, and the hair follicles also relaxation, thus creating easy to fall in the state, combing their hair, a slight pull of can make hair loss. This is the end of the hair cycle, old wool hair physiological phenomenon, known as the natural hair loss.

Avoid alopecia

Some recipes will most help.

Understand their own hair; should be used in the fit and quality hair care products; best hair growth treatment

1. Often do massage to promote metabolism, prevent hair calcification;

Avoid over-blown, stained, electricity damaging hair;

Focus on a balanced diet, eat more fruits and vegetables;

4. Avoid mental stress, sufficient sleep, and nutritional considerations, there are adjustments on the rest.



Dander Bacillus bacteria



The follicle structure follicles hole grease blocking

Hair root profile icon

Hair follicle without grease blockage

The oil secretion follicularis transition exuberant


Hair follicle clogged by grease

Hair root is grease-coated


The roots of the hair grease accumulation raised

The dandruff push accumulating


Healthy hair


The top of the hair follicles excessive secretion of oil


The occipital hair follicle slightly more oil secretion 




Female pattern hair loss


Male pattern hair loss