Hair loss is a common dermatologic disease, of which androgenetic alopecia is the most common clinical hair loss disease, and other more common types of hair loss also include patch baldness, pulling hair loss, scarring hair loss, and so on. Although alopecia areata does not affect the patient's physical health, it seriously affects the patient's psychological health and quality of life. Androgenetic alopecia is the most common hair loss disease, the prevalence of which varies significantly among different races, with Caucasians having the highest prevalence and yellow and black races having relatively lower prevalence. The latest data in China shows that the prevalence of hair loss is about 21.3% in men and 6.0% in women. In other words, one out of every five Chinese men suffers from hair loss. The data also showed that 53.3% to 63.9% of male patients have a family history of hair loss, with paternal genetic risk significantly higher than maternal genetic risk.
Patchy baldness also has a certain heritability, the population incidence of about 0.1% to 0.3%, of which about a quarter of patients have a family history, 7% to 27% of patients with a combination of Hashimoto's thyroiditis, goiter, and other thyroid diseases.
Hair loss of more than 100 hairs per day, or patchy hair loss
Large amounts of hair loss resulting in thinning hair, or patchy hair loss forming bald patches
After defining the cause of the disease, different treatments are taken to deal with the cause of the disease
The disease can be reduced or cured by treatment
Disease Definition
Each person has about 100,000 hairs. It is normal to lose up to 100 hairs per day and for hair loss to be even. If you lose more than 100 hairs per day, or if you experience patchy hair loss, you may be experiencing pathologic alopecia. Hair loss is medically defined as the abnormal loss of hair due to heredity, immunity, stress, taking certain medications, endocrine disorders and other factors, resulting in thinning of the hair or the formation of bald patches.
Hair loss is a common dermatologic disease, of which androgenetic alopecia is the most common clinical hair loss disease, and other more common types of hair loss also include patch baldness, pulling hair loss, scarring hair loss, and so on. Although hair loss does not affect the physical health of patients, it seriously affects their psychological health and quality of life.
Epidemiology
Androgenetic alopecia is the most common type of alopecia, the prevalence of which varies significantly among different races, with Caucasians having the highest incidence, and the incidence of yellow and black races being relatively low. The latest data in China shows that the prevalence of hair loss is about 21.3% in men and 6.0% in women. In other words, one out of every five Chinese men suffers from hair loss. The data also showed that 53.3% to 63.9% of male patients have a family history of hair loss, with paternal genetic risk significantly higher than maternal genetic risk.
Patchy baldness also has a certain degree of heredity, the population incidence of about 0.1% to 0.3%, of which about a quarter of patients have a family history, 7% to 27% of patients with a combination of Hashimoto's thyroiditis, goiter and other thyroid disorders, 4% to 9% of patients with a combination of vitiligo.
Information on the prevalence of other types of alopecia is lacking.
Types of disease
Based on the different causes, alopecia areata is mainly categorized into androgenetic alopecia, pemphigus vulgaris, scarring alopecia and other types, in addition to infectious alopecia, congenital alopecia, and some other rare types.
Androgenetic alopecia
The most common type of alopecia is known as seborrheic alopecia or early baldness, an androgen-dependent hereditary disease, which is characterized by a persistent decrease in the density of hair on the top of the head, and in men, by a receding hairline.
Patch baldness
This is a sudden onset of limited alopecia with generally normal localized skin. The cause of the condition is unclear, and may be related to factors such as genetics, stress, allergies, and autoimmunity.
Restorative alopecia
At least 80% of normal human scalp hair follicles are in the anagen phase, and thus hair will not fall out synchronously. However, due to reasons such as post-surgery, post-partum, blood loss, shock, and severe mental stimulation, more hair follicles can be prompted to enter into the restorative phase in advance, which can lead to the synchronous loss of a larger number of hairs.
Hair loss in the anagen phase
After taking cytotoxic drugs up to a certain dose, most of the hair in the anagen phase suddenly stops growing in a relatively short period of time, and a large number of hair loss, which is commonly seen in chemotherapy patients.