What causes hair loss at the back of the head?

Hair loss at the back of the head may be caused by various factors, including but not limited to genetics, hormonal imbalances, lifestyle habits, stress, malnutrition, and scalp problems: 1. **Genetic factors**: Genetics is a common cause of hair loss, especially androgen-dependent alopecia. If there is a family history of hair loss, the individual's risk of developing hair loss will be relatively higher. 2. **Hormonal imbalances**: Hormonal imbalances may disrupt the hair growth cycle, leading to hair loss. For example, conditions such as thyroid dysfunction and polycystic ovary syndrome (PCOS) may cause fluctuations in hormone levels, which can affect hair growth. 3. **Lifestyle habits**: Unhealthy lifestyle habits, such as chronic stress, high levels of pressure, insufficient sleep, smoking, and excessive alcohol consumption, can all negatively impact hair growth and health, potentially causing hair loss at the back of the head. 4. **Malnutrition**: Nutritional deficiencies, especially a lack of key nutrients such as iron, zinc, and biotin, may restrict hair growth and lead to hair loss. 5. **Scalp problems**: Scalp conditions such as seborrheic dermatitis and scalp injuries may also cause hair loss at the back of the head. Seborrheic dermatitis can damage the skin and hair follicles, impairing normal hair growth; while scalp injuries may interfere with the follicles' ability to supply nutrients to the hair, resulting in hair loss and potentially requiring other medical interventions.