I. Hair growth cycle
1, anagen phase: hair maternal cells grow vigorously, the hair grows about 1 cm per month, which can last 2-6 years.
2.Regressive phase: lasts 2-4 weeks, when the hair stops growing and does not produce melanin, and the bottom of the hair follicle begins to move to the skin surface.
3, the resting phase: lasts 3-4 months, this period of hair shedding hair follicles began to grow new hair.
Second, the shedding of hair
The old hairs fall off naturally or are easily plucked out without pain as the bottom of the follicle moves upward. Most of the hair shed by combing or washing hair is from this phase. At any given time about 1/10th of the hair follicles on the head are in the resting phase.
Normal hair shedding: There are about 100,000 hairs on the human head, usually 85%-90% of the hair is in the anagen phase, 1% in the regression phase, and only 10%-14% in the resting phase, and the normal average number of hair loss is 50-100 hairs per day. The daily growth rate of hair in the anagen phase varies slightly with age, gender and season. The actual density of hair follicles decreases with age.
III. Signs of hair loss
Average hair loss of more than 100 hairs per day for more than 2~3 months! A doctor needs to be consulted to identify the cause.
IV. What factors are related to hair loss?
1.Genetic factors
A portion of people with male pattern baldness (early baldness) can be found to have a family history of heredity. In male pattern baldness, the genetic predisposition is manifested only under the condition of androgen action, which is called autosomal dominant genetic disorder in medical genetics. Some baldness is also related to heredity; about 10%-20% of patients with baldness have a history of the same disease in their families.
2.Endocrine factors
The concentration of dihydrotestosterone (an androgen metabolite) in the scalp at the site of hair loss is higher than that of normal people. Scientists have found that a 5a reductase protease in the scalp can convert testosterone into dihydrotestosterone. Baldness is related to abnormal metabolism of thyroxine.
3.Mental factors
People who are in a highly stressful and busy working environment for a long time may experience diffuse or restricted hair loss. This mental stimulation may cause the autonomic or central nervous system to become dysfunctional, affecting the hair follicle papilla microvascular circulation, thus leading to the inhibition of hair growth function.
4, visceral diseases
Certain diseases can often be accompanied by hair loss performance, such as anemia, leukemia, cancer, etc. This kind of hair loss is called symptomatic baldness.
5.Scalp Diseases
Some skin diseases that occur on the scalp, such as lichen planus, discoid lupus erythematosus, warty nevus, etc., can cause local destruction of hair follicles and lead to hair loss and difficult regeneration – pseudo-baldness.
6.Dietary factors
Lack of certain nutritional elements in the diet can cause hair loss, such as long-term lack of cystine, the main raw material of hair, and vitamins A, B2, B6, C, calcium, phosphorus, folic acid, etc., which are necessary for hair formation, can lead to poor hair growth or hair loss.
7.Drug factors
Oral intake or injection of certain anti-cancer or immunosuppressive drugs, especially after long-term or mass application, can often cause diffuse hair loss due to the inhibition of hair follicle growth function, which can gradually return to normal after stopping the drug.
8.Radiation
X-rays, radium, 90 strontium, 32 phosphorus and other radiation or radionuclides have been widely used in the treatment of malignant tumors or certain other diseases, which may lead to hair loss when a certain cumulative amount is reached.
9.Local damage to the scalp
Mechanical external factors or accidental exposure to some high temperature or chemicals caused by some girls due to braid women due to over tightening with curling clips can cause hair loss, become traction alopecia.
10.Infection factors
Bacterial or fungal (mold) infection of the scalp, if the lesion involves the hair follicle or deep skin tissue (dermis, subcutaneous tissue), causing structural damage, it often leads to hair can not be regenerated, for scarring baldness, baldness folliculitis, boils, secondary pyoderma and ringworm (yellow ringworm, pustular ringworm), etc.
V. Hair maintenance and care
1.Adjustment of living habits
Live a regular life, arrange the rest time, ensure good sleep, maintain a good state of mind, eliminate psychological pressure, positive and optimistic, avoid excessive smoking and drinking.
2.Adjust your mood
For all types of baldness, especially for patients with baldness, total baldness and male pattern baldness, in addition to receiving the necessary medication or other treatments, it is crucial to keep your mood comfortable, eliminate unnecessary tension and overcome inferiority complex.
3.Rational intake of nutrients
Through the coordination of a variety of nutrients, in order to play their unique nutritional functions; the daily diet includes the following five major food groups.
(1) Cereals, potatoes, dry legumes.
(2) Animal foods such as meat, poultry, eggs, fish and milk.
(3) Soybeans and their products.
(4) Vegetables, fruits.
(5) animal and vegetable fats and oils, edible sugar.