What causes hair loss and baldness?

Hair loss and baldness are typically associated with multiple factors, mainly including the following: 1. **Genetic factors**: Baldness and hair loss have a strong hereditary tendency, especially androgenetic alopecia. If family members have this condition, the probability of offspring developing it is relatively higher. 2. **Hormone levels**: Androgens play a significant role in hair loss, which is more common in males. Abnormal androgen levels may cause follicle atrophy, leading to hair loss. 3. **Lifestyle habits**: Unhealthy lifestyle habits, such as chronic sleep deprivation and unbalanced diet, may interfere with hair follicle growth and lead to hair loss. 4. **Psychological stress**: Long-term mental stress may trigger autonomic nervous system dysfunction, affecting blood supply and nutrition to the hair follicles, resulting in hair loss. 5. **Other diseases**: Certain autoimmune diseases, such as Hashimoto's thyroiditis and diabetes, may also cause hair loss.