What are the causes of alopecia areata?

The main causes of alopecia areata include: 1. Genetic factors: Alopecia areata has a certain hereditary tendency. Clinical data show that approximately 25% of patients with alopecia areata have a family history. Genetics may be a significant contributing factor, especially when multiple family members are affected. 2. Psychological factors: Prolonged mental stress, tension, anxiety, and other emotional issues may trigger alopecia areata. These psychological conditions can lead to autonomic nervous system dysfunction, thereby affecting normal hair growth. 3. Autoimmune factors: Alopecia areata is associated with autoimmune diseases. The immune system may mistakenly attack hair follicles, resulting in hair loss. For example, autoimmune conditions such as Hashimoto's thyroiditis and diabetes may induce alopecia areata. 4. Other factors: Malnutrition, environmental influences, endocrine disorders, and similar conditions may also play a role in the development of alopecia areata.