Abstract: Normal hair growth cycle is divided into anagen, catagen, and telogen phases. Normally approximately 50-100 hair is shed daily. Hair loss can cause significant psychological distress in children and adolescents. Causes of hair loss are numerous; the most common causes of hair loss in children and adolescents include tinea capitis, telogen effluvium, androgenic alopecia, alopecia areata, and traumatic alopecia. This discussion reviews the epidemiology, diagnostic approach, and management of common causes of hair loss in children, adolescents, and young adults.