What causes hair loss and baldness?

There are various reasons for hair loss and baldness, mainly including the following: 1. **Genetic factors**: Genetics is one of the most common causes of baldness, especially androgenetic alopecia, which tends to run in families and affects males more easily. 2. **Hormonal imbalance**: In women, hair loss may occur during periods such as pregnancy and menopause due to changes in hormone levels. 3. **Malnutrition**: Long-term malnutrition can lead to weak and brittle hair that is prone to falling out. 4. **Excessive stress**: Prolonged high-stress states can affect the nervous system and blood circulation, leading to hair loss. 5. **Medication side effects**: Certain medications, such as chemotherapy drugs and antidepressants, may cause hair loss. Additionally, fungal infections and immune system disorders can also be causes of hair loss. For hair loss issues, it is recommended to consult a professional doctor and choose an appropriate treatment method based on individual circumstances.