What causes alopecia areata

Alopecia areata, a localized hair loss, is relatively rare. Although it is not fatal, it can threaten people's health when it becomes severe. Patients with particularly severe alopecia areata may lose all their body hair. Alopecia areata is also commonly known as "alopecia areata" because the hair loss appears as small round patches, which looks scary. So what causes alopecia areata?

Alopecia areata is a localized patchy hair loss that manifests as round or oval patchy hair loss on the head. Most cases have a smooth and shiny scalp. As the disease progresses, the damage expands and the peripheral hair becomes loose and easy to fall off. Some patients lose all their hair. In severe cases, eyebrows, beards, armpit hair, and pubic hair may all fall off. The best time for clinical treatment of hair loss is in the early stages. It is necessary to examine the specific cause in detail and then treat it symptomatically. Do not use medication blindly, otherwise it will aggravate hair loss.

1. Some alopecia areata is a concomitant manifestation of other diseases. For example, patients with hypothyroidism or hyperthyroidism, hypoparathyroidism, anemia, lupus erythematosus, vitiligo, intestinal parasitic infection, etc. are more likely to develop alopecia areata than normal people. As to the cause of the child's baldness, it remains to be determined. cure.

2. The incidence of alopecia areata increases in Down syndrome, often causing total alopecia or universalis. The presence of autoantibodies was significantly increased in these patients. It is not certain that alopecia areata is an autoimmune disease, but the fact that it may be accompanied by autoimmune diseases and is temporarily effective against corticosteroids suggests that it tends to support the autoimmune theory.

A study on the correlation between alopecia areata and human leukocyte antigen showed that the HLA-A9 antigen frequency of alopecia areata patients (16.67%) was significantly lower than that of normal people (32.65%). This proves from an experimental perspective that the onset of alopecia areata is caused by certain genetic allergic factors. Neuropsychiatric factors are considered to be an important factor. Many cases experience neuropsychiatric trauma before the onset of the disease, such as long-term anxiety, worry, sadness, mental tension and emotional instability. Sometimes during the course of the disease, these mental factors can rapidly worsen the patient's condition.