Chen Xue

associate chief physician

Peking university people's hospital dermatology top three

The specific reasons for serious hair loss are uncertain, mainly related to the following reasons.

(1) chemistry: chemical factors such as excessive hair dyeing and some unqualified shampoo products can lead to hair discoloration or even hair loss.

(2) Physicality: Common physical factors causing alopecia include mechanical stimulation and exposure to radioactive substances.

(3) Nutrition: Hair is an external manifestation of physical condition. Malnutrition and abnormal metabolism can cause changes in hair quality and hair color, severe malnutrition and even diffuse alopecia.

(4) Infectious: The infection of various pathogens is an important factor of hair diseases, mainly including bacteria, viruses, fungi, spirochetes, parasites and other infections.

(5) Congenital: complete loss or thinning of hair caused by developmental defects. Patients often have sparse and slender hair, or their hair is normal at birth and will not regenerate quickly, which can be divided into isolated defects and other deformities.

(6) Endocrine: The growth of hair is influenced by many endocrine hormones, so when the endocrine is abnormal, it will often cause alopecia diseases, such as hypothyroidism.