Hormonal Changes: Pregnancy, childbirth, menopause, and hormonal contraceptives can all lead to telogen effluvium. Nutritional Deficiencies: Iron deficiency, low levels of zinc, and other nutrient deficiencies can contribute to hair loss. Stress: Emotional or physical stress can trigger telogen effluvium by disrupting the hair growth cycle. Medical Conditions: Thyroid disorders, polycystic ovary syndrome (PCOS), and chronic illnesses can also be contributing factors.