1.Mental or physical factors.
Excessive mental stress is a common cause of hair loss. Mental tension, depression, fear or serious insomnia can lead to neurological disorders, capillaries continue to be in a state of constriction, hair follicles do not get sufficient blood supply, and the scalp is located in the uppermost part of the body, so the hair is most likely to fall off. If the stress continues, coupled with a weak psychological quality, it is easy to occur hair breakage (hair) fetish, hair eating (hair) fetish, hair pulling fetish, etc.. Trauma to the head, lesions of the spinal cord, medulla oblongata, midbrain and brainstem can cause hair loss. Mental factors can also seriously affect the hair growth cycle. Prolonged visual fatigue, excessive mental stress, excessive nervousness, impatience or apprehension, and staying up late can all lead to shortening of the hair growth cycle and hair loss, resulting in premature baldness. Commonly, such as postpartum hair loss, hair loss after serious illness, hair loss after examinations, and hair loss of some unit heads or businessmen who bear great responsibility.
2. Hormone imbalance and genetic factors.
The growth hormone secreted by the pituitary gland can promote the growth of hair, while the lack of growth hormone will make the growth of hair relatively slow; sex hormones also affect the beauty of hair: female hormones make hair soft and lustrous; male hormones make hair hard and thick, once the body sex hormones are out of balance, hair abnormalities may occur. Therefore, postpartum, menopause and oral contraceptives can cause hair loss due to estrogen deficiency for a certain period of time; hypopituitarism, adrenal tumors and advanced acromegaly can lead to hair loss. Most women lose their hair near menopause, and it is confirmed that hair loss can indeed be caused by hormones. If this is the case, you can choose to receive hormone therapy or take medication prescribed by your doctor.
3. Factors of disease and medication.
Anemia, malnutrition, acute hyperthermia, infectious diseases or long-term liver disease can affect the growth and color of hair if they interfere with the function of hair cells at the root, or even cause the normal division of hair cells to be inhibited, leaving the hair in a resting phase and hair loss. In addition, when suffering from ovarian tumor, it can increase dandruff and greasy hair due to excessive androgen secretion, leading to seborrheic dermatitis and hair loss.
4, the relationship between drugs and hair.
Many drugs can damage hair and hinder beauty. Immunosuppressants, chemotherapy drugs, arsenic agents and other drugs can cause hair loss, long-term use of antibacterial agents and painkillers, prone to thin and short hair, the phenomenon of loss. Some nutritional supplements contain stimulants, which can easily damage hair with long-term use. Common medications such as antidepressants and high blood pressure medications can cause hair loss and the doctor can advise the patient to switch to another medication.
Other medications such as chemotherapy, diet pills, stomach ulcer pills, vitamin A acid, and chemotherapy for cancer treatment are known to cause hair loss. When chemotherapy is stopped, hair will grow back gradually.
5.Food and nutrition metabolism factors.
Malnutrition caused by partial diet, unbalanced nutrition or impaired absorption due to poor digestion and chronic wasting disease can lead to the suppression of normal hair growth and the entry into the resting phase, and hair thinning, scorching, early graying or loss. Excessive sugar or salt consumption, protein deficiency, iron deficiency, zinc deficiency, excessive selenium, etc., as well as certain metabolic diseases such as argininosuccinic aciduria, homocystinuria, hereditary orotateuria, disorders of methionine metabolism, etc., are also causes of hair loss.
6, the relationship between nutrients and hair.
Iodine can promote the formation of melanin in the hair cortex, help the cell proliferation active, produce sufficient amount of melanin, iodine deficiency in the growth process of black hair will become white; calcium human body lack of calcium, the hair will become excessively thick, dry and fragile easy to break; vitamin lack of folic acid, pantothenic acid or B vitamins, the hair will become gray; protein serious lack of protein children, the hair will slowly become red; metal elements Zinc deficiency will lead to hair loss and baldness; lack of copper, iron and cobalt will cause hair to gradually turn yellow until it turns white.
5. Congenital factors.
Congenital factors such as: complete absence or thinning of hair caused by developmental defects, various syndromes, premature aging diseases, etc.; hair follicle dysplasia causes fine, soft and easily broken hair. Congenital baldness is an autosomal dominant genetic disorder, mostly seen in the offspring of consanguineous marriages.
6. Physical and chemical factors.
The living environment is closely related to the beauty of hair. The black smoke and exhaust gas in modern cities seriously pollute people’s living space, thus harming the hair; long-term work under strong sunlight can cause the melanin of the hair to fall off and turn brown, and can cut off the protein supply in the hair, making the hair rough and shiny.
Physical factors such as strains, abrasions, burn trauma and electric injuries; hair loss caused by physical factors: including mechanical hair loss such as hairstyle hair loss and local friction irritation hair loss; radioactive damage is clinically classified into four degrees, all of which can cause hair loss; excessive exposure to ultraviolet rays in sunlight and frequent use of hot blow dryers also tend to thin hair.
Hair loss caused by physical factors is also called physical hair loss.
Chemical factors such as boric acid in shampoo or hair dyeing and perming potions: perms, hair cleansers, hair dyes and other hair cosmetics are common causes of hair loss. In recent years, the incidence of women’s hair thinning has been increasing, which may be related to the abuse of hair cleansers due to some irresponsible advertising. Hair loss caused by chemical factors is also called chemical alopecia.
7, endocrine disorders of factors.
Endocrine factors such as hyperthyroidism; overactive and underactive thyroid gland may cause hair thinning and thinning, thyroid supplements can make hair back to normal. The amount of thyroid hormone secretion is also related to the quality of hair: when the thyroid gland is hyperactive, the hair is fine and soft, while when it is hypothyroid, the hair is dry and lusterless.
8, immune system function response flocculation.
The immune system may attack the hair follicles, resulting in hair loss, such as autoimmune flocculation like lupus erythematosus caused by hair loss; doctors usually inject a small amount of steroids directly into the location of the patient’s hair loss.
9, improper care and human factors.
(1) Wearing a cap all day will compress the scalp blood vessels and affect blood circulation. Especially in the hot summer, the cap hinders ventilation, easy to make hair loss over time.
(2) excessive alcohol abuse will lead to gastrointestinal diseases, thus affecting the digestion and absorption of protein, vitamins and other nutrients; wine contains preservatives also have a great negative impact on the beauty of hair.
(3) Frequent consumption of carbonated beverages stimulates the stomach and intestines, causing digestive disorders and affecting the absorption of nutrients, resulting in hair loss.
(4) excessive exercise will also affect the health of the hair, will appear soft and fine hair and lead to hair loss.
(5) living in air-conditioned rooms for a long time, can lead to increased dandruff and hair loss.
10, improper hair care and hairdressing.
(1) knife hair tip easy to damage the hair medulla, hair cortex and hair epidermis, often hair splitting and breaking phenomenon, especially immediately after cutting hair perm, more damage to the hair. Cut the hair with scissors, will not damage the hair ends, the hair will continue to grow healthy.
(2) Improper perming and hair coloring can damage the hair cortex. The perm water can dissolve the protein and fat in the hair cortex, making the hair soft and wavy; the hair dye can remove the melanin in the hair cortex, and then penetrate into the hair dye. Therefore, the quality of perm and hair dye, the dosage and application methods are very important, the correct and appropriate use can reduce the damage to the hair.
(3) too much use of hair dryer will damage the hair cortex and hair medulla, making the hair dry, split ends, thinning until shedding.
(4) Incorrect choice of hairbrush and incorrect combing method can damage the hair. Can produce electrostatic effect of nylon hairbrush, combing can produce up to hundreds of volts of electrostatic, from the hair stem to the hair root under the discharge, resulting in bubbles between the pores and hair root tissue, after a long time, pores and hair root completely loose, and cause hair loss; wire brush and hairbrush made of pig hair will damage the hair, should not be used, the best choice of rubber or plastic hairbrush or horned wooden comb.
(5) improper choice of shampoo will affect the hair health and beauty. The petroleum series shampoo and conditioner sold on the market can damage the sebum component of the scalp, leading to increased dandruff and dry scalp.
11, fungal infection, parasites, viruses and septic skin diseases and other factors.
Infectious alopecia: head chickenpox, herpes zoster virus, human immunodeficiency virus (HIV), Mycobacterium leprae, Mycobacterium tuberculosis, syphilis pallidum spirochetes, and various fungus-induced ringworm can cause hair loss. Local skin lesions such as seborrheic dermatitis, lichen planus, and infection with mold or parasites are also major contributors to hair loss. Lipophilic fungi on the scalp proliferate under the premise of high sebaceous gland secretion, and the plague of lipophilic fungi obtain nutrients from hair follicles and discharge metabolites there, stimulating chronic inflammation of hair follicles and scalp – seborrheic dermatitis, gradual atrophy of hair follicles, gradual decrease of hair growth function, and gradual decrease of hair until baldness. The head mite is a tiny parasite that cannot be seen by the naked eye. It lives in human hair follicles, feeds on sebum and secretes lipolytic enzymes (lipase) that attack the sebaceous glands and block the hair follicles, resulting in hair loss or baldness.