What causes white hair?

The appearance of white hair is usually caused by the decline or loss of function of melanocytes in hair follicles. These cells are responsible for producing the pigment that gives hair its color. Below are some common causes: 1. Physiological factors: As people age, hair follicles gradually atrophy, melanin production decreases, and hair turns white. This is considered a physiological process and generally does not require treatment. 2. Genetic factors: Conditions such as albinism and progeria may lead to white hair. Albinism is a protein-deficiency disease; dietary intake of protein, such as from lean meat, eggs, etc., can help supplement protein levels. 3. Psychological factors: Prolonged depression, anxiety, significant emotional fluctuations, and stress may also cause hair to turn white. Traveling, engaging in physical exercise, and communicating more with family and friends can help relieve negative emotions. 4. Autoimmune diseases: In certain cases, such as vitiligo, the body's immune system attacks its own melanocytes, leading to white hair. 5. Nutritional deficiencies: Deficiencies in B vitamins may result in white hair. It is important to identify specific deficiencies and provide targeted treatment accordingly.