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1. Definition of hair health and hair loss.

The most representative symptom to check the health status of hair is hair loss, which means hair loss in the area where it should normally be, and human hair has an independent hair follicle cycle, maintaining a nearly constant number of hair.

Hair is eliminated after growing up for three years, and hair grows again three months later, and hair growth and elimination are repeated.

The number of hair in a person typically ranges from about 100,000 to 150,000 and can be considered within the range of hair loss if more than 100 are continuously lost every day.

The growth cycle of hair is the growth phase, which forms the growth of hair cells by differentiation of hair cells, and the three-month period when hair follicles stop growing and the hair follicles stop growing and stop growing.

Through this period, the loss of hair is called "natural hair loss," and the phenomenon of changing the growth cycle due to various factors, causing more hair loss per day than necessary or thinning hair is called "abnormal hair loss."

2. The Cause and Understanding of Hair Loss.

The causes of hair loss vary from person to person, and most of them are often caused by a combination of various factors, and the factors known as the causes of hair loss are as follows.

1) Genetics.

Genes that cause hair loss have yet to be discovered, but the cause of genetic hair loss is known to be genetic factors related to male hormones, which have been found to be a combination of several genes.

Male-type hair loss is commonly caused by androgen, a male hormone, which inhibits hair development, and causes thinning and loss of strength along with falling out.

Genetic androgen androgen alopecia is the most common type of alopecia, and when androgen is secreted in people with family backgrounds, it begins to progress, which is closely related to age.

These male hair loss symptoms are naturally reduced because the number of hair loss is not regenerated after the hair is removed, and the number of hair naturally decreases, usually from the top of the head to a round U shape, and the forehead is protruding into an M shape.

The scalp has more hair follicles and sebaceous glands than other body parts, and hair follicles are classified as androgen-dependent tissue along with sebaceous and apocrine glands.

Androgens play a role in many skin tissues that cause simulated proliferation, but in the scalp, genetic factors lead to hair loss.

2) Stress.

Modern people are exposed to various stressors, and when mental fatigue accumulates, it stimulates sympathetic nerves or autonomic nerves, and constricts blood vessels due to the overaction of adrenaline.

At this time, blood vessels in the scalp may contract and muscles may become tense, causing blood flow disorders, reducing the ability to excrete waste in tissues and causing hair loss due to poor nutrition to hair roots.

3) Pathological factors.

High fever caused by infectious diseases such as typhoid or thyroid diseases can cause rapid damage to hair roots, resulting in acute growth period hair loss, and hair loss due to scalp white lines, syphilis, and tectonic dermatitis.

In addition, circular alopecia may be caused by hormonal abnormalities such as pituitary dysfunction and thyroid diseases, or by autoimmune diseases.

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