Objetivos: determinar la prevalencia de estrias atroficas e identificar la frecuencia de lo factores de riesgo relacionados con su aparicion en mujeres adolescentes. Metodos: se realizo un estudio descriptivo en 210 estudiantes entre 12 y 18 anos de dos establecimientoseducativos privados de la ciudad de Medellin, Colombia. A cada estudiante se le aplico unaencuesta autodirigida y se le realizo un examen fisico para observar la presencia de estrias. Resultados: el 75,2 % de las adolescentes presentaron estrias, el 59,5 % tenian entre 15 a 18anos. La localizacion mas frecuente fueron los gluteos (78,3 %). Se encontro asociacion entre lasestrias y factores como: obesidad (p=0,011), antecedentes familiares positivos (p=0,006), uso de hormonas no esteroideas (anticonceptivos) (p=0,003), consumo de productos dieteticos (p=0,025) y grasas (p= 0,026). No se encontro correlacion con el fototipo, enfermedades, uso de esteroides, habito de fumar y practica de ejercicio. Conclusiones: las estrias atroficas son una entidad clinica de alta prevalencia en mujeres jovenes, afectando multiples zonas corporales con deterioro de la autoimagen. Ciertas conductas de alimentacion y consumo de medicamentos, ademas de los antecedentes familiares, pueden estar implicados en el aumento de la frecuencia de esta enfermedad ABSTRACT Objective: This study was designed to determine the prevalence of stretch marks in adolescent young woman and to identify the associated risk factors. Methods: It was performed a descriptive study on 210 students between 12 and 18 years old from two private schools in Medellin, Colombia. Each student answered a questionnaire and was examined. Results: 75.2 % of the adolescents had stretch marks and 59.5 % of them were between 15 and 18 years old. Most frequent affected body site was the buttock (78.3 %). It was found a greater prevalence between the presence of stretch marks and factors like: obesity (p=0.011), family members with stretch marks (p= 0.006), use of nonsteroidal hormones (p=0.003), diet products (p=0.025), and fats (p=0.0265). It was not found association with phototype, diseases, glucocorticoids, smoking or exercise. Conclusions: The stretch marks are very frequent in adolescent female, they are a source of esthetic discomfort and have great psychological impact on those who have them. Eating habits, medications intake, personal and family histories can influence the appearance of stretch marks.