10 tips about hair! How much do you know?
1. What is the appearance and structure of the hair?
Hair is an accessory organ of the skin. It is a long cylindrical keratinous structure. The part exposed on the skin is called the “hair shaft”, the part buried in the flesh of the skin is called the “hair root”, and the end of the hair root swells in the shape of an onion, called the “hair ball”. “. Hair can usually be divided into two types: bristles and vellus. The bristles are thick and hard, with soft and dark color, and can be divided into long hair (such as hair, beard, armpit hair, pubic hair, etc.) and short hair (such as eyebrows, eyelashes, nose hair, etc.) ). The vellus hairs are soft and light in color, mainly found on the face, limbs and trunk.
2. How many hairs does a person have?
Human hair varies from race to race, and the number of hair varies slightly depending on the color. The yellow race has 100,000 hairs, the blond-haired whites have thinner hairs of 120,000, and the red hairs are slightly thicker, with 80–90,000. Childhood hair is densest on the top of the head, and slightly thinner on both sides of the temple.
3. How much hair grows every day?
Generally it grows 0.27–0.4mm per day, grows about 1cm on average per month, and grows about 10–14cm per year. However, it is impossible for hair to grow without restriction. Under normal circumstances, hair grows to 50–60cm, it will fall off and regenerate new hair.
4. What is the growth cycle of hair?
The growth cycle of hair can be divided into three stages: growth phase, anagen phase and telogen phase. The growth phase of hair is about 2–6 years, the anagen phase is 2–3 weeks, the telogen period is about 3 months, and the normal total is about 100,000 hairs. In the hair, the growth period accounts for about 85%-90%, the anagen period accounts for 1%, and the resting period accounts for 9%-14%. The hair in the resting period will fall off when shampooing, combing and scratching the scalp.
5. How much hair loss per day is considered normal?
The average person loses 50–100 hairs per day on average. This is the process of hair metabolism. When old hair falls off, new hair can grow out. This is a normal physiological phenomenon. However, when the hair begins to fall out a lot, so that it is bald, or the hairline recedes, it may mean some more serious problems.
6. How to classify hair loss?
There are two main types of hair loss: neuropathic alopecia and seborrheic alopecia. Neuropathic alopecia includes alopecia areata, total alopecia and general alopecia. Seborrheic alopecia, also known as androgen-induced alopecia, is generally called baldness, commonly known as “shading”.
7. How to divide the grade of hair loss?
Male hair loss classification The Hamilton classification is commonly used internationally to distinguish the degree of hair loss. There are 7 grades and 13 types of hair loss, of which grades 1–3 belong to mild hair loss, grades 4–5 belong to moderate hair loss, and grades above 6 belong to severe hair loss.
8. What are the causes of hair loss?
The main causes of hair loss are: genetic factors, diseases (such as systemic lupus erythematosus, typhoid fever, liver disease, etc.), mental stimulation, drugs (such as anti-tumor epilepsy, tuberculosis drugs, etc.), seasonal climate, malnutrition, endocrine disorders, etc. In addition, smoking and drinking alcohol will also have an adverse effect on hair growth.
9. What are the symptoms of seborrheic alopecia?
In the initial stage, the head is often itchy. When scratching or combing the hair, a large amount of hair falls off, the hair roots are short and the hair balls disappear. Symptoms of hair loss progress slowly, may be staged, sometimes light and heavy, and may cause sparse hair on the top of the head or temples and shiny scalp after several years. The head is greasy and greasy or desquamated, and the hair is soft and yellow.
10. How to prevent hair loss?
Eliminate mental depression, take more deep breaths, and maintain an optimistic mood; reduce hair dyeing and perm, which will make hair lose luster and elasticity, and even turn yellow and dry; pay attention to diet and avoid spicy and greasy food. Quit smoking, drink alcohol in moderation, stay up late or stay up as little as possible, and avoid using the computer for a long time.
Once the hair loss problem occurs, it is very important to find out the cause of the hair loss, see what causes the hair loss, and then treat it symptomatically. If the hair follicles are not atrophy or necrosis, it is recommended to choose an effective hair growth and hair care product.