Why Do Some People Experience Hair Loss?

Hair loss is primarily caused by insufficient nutrition of hair follicles. Generally speaking, it is normal to lose some hair every day, but many new hairs will also grow back. Unhealthy lifestyle habits can lead to excessive hair loss, and even some pathological reasons can result in baldness. To prevent hair loss, incorporating foods such as black sesame seeds, walnuts, and black rice into your daily diet can be beneficial.

Hair loss refers to the phenomenon of hair falling out. Normally, hairs that fall out are in the catagen or telogen phase of the hair growth cycle. The continuous dynamic balance between hairs entering the catagen phase and new hairs entering the growth phase maintains a normal number of hairs on the head. Pathological hair loss refers to abnormal or excessive hair loss, which can have many causes.

1. Androgenic alopecia is an autosomal dominant inheritance, and its genetic characteristics are manifested under the influence of androgens.

2. Neurogenic alopecia often occurs when there is excessive mental stress. Under the influence of mental stress, the erector pili muscles contract, causing the hair to stand upright. This can disrupt the function of the autonomic nervous system or central nervous system, leading to changes in the hair follicles and malnutrition, which inhibits hair growth and results in hair loss.

3. Endocrine alopecia occurs when there are abnormalities in endocrine hormones that affect hair growth. This can lead to hair loss diseases such as postpartum hair loss and menopausal hair loss.

4. Nutritional alopecia is caused by malnutrition and abnormal metabolism in the body, which can lead to changes in hair quality and color. Severe malnutrition can even cause diffuse hair loss.

5. Physical alopecia can be caused by physical factors such as mechanical stimulation and exposure to radioactive substances.

6. Chemical alopecia occurs when chemical factors alter hair color or even cause hair loss.

7. Infectious alopecia is caused by various pathogens, including bacteria, viruses, fungi, spirochetes, and parasites.

8. Symptomatic alopecia can accompany certain systemic or local diseases.

9. Congenital alopecia is caused by developmental defects that result in complete absence or sparsity of hair. This can manifest as thin and sparse hair or normal hair at birth that falls out and does not regrow.

10. Seasonal alopecia is common in summer due to higher temperatures and dilated pores, while hair loss is less common in autumn and winter when temperatures drop and pores close.