Se realizo un estudio descriptivo y longitudinal con el proposito de describir la presencia de algunos factores epidemiologicos asociados a las Enfermedades Diarreicas Agudas. Se estudiaron 250 ninos menores de 12 meses ingresados por esta causa en el Servicio de Gastroenterologia Aguda del Hospital Docente Pediatrico Provincial Pepe Portilla de Pinar del Rio, durante el periodo comprendido de Enero a Diciembre del ano 2005, utilizando como fuente de informacion las encuestas realizadas a las madres, ademas de revisar las historias clinicas de estos casos. Los resultados obtenidos demostraron que la edad menor de 6 meses constituyo un factor de riesgo, no viendose diferencias importantes en cuanto al sexo. La malnutricion proteico - energetica no represento un problema. La escasa administracion de Lactancia Materna Exclusiva y las condiciones de la vivienda deficientes fueron otro factor asociado a las diarreas. Para el analisis estadistico utilizamos media porcentual y prueba de hipotesis Chi Cuadrado. Palabras clave: Enfermedades Diarreicas Agudas, Factores epidemiologicos, Malnutricion Proteico - energetica, Lactancia Materna Exclusiva, Condiciones de la vivienda deficientes. ABSTRACT A descriptive and longitudinal study was carried out, aimed at describing the presence of some epidemiological factors associated with acute diarrhoea deseases. A sample of 250 infants under 12 months of age were admitted to Gastroenterology Service a Pepe Portilla Provinicial Pediatric Teaching Hospital in inar del Rio during January to December 2005, using the surveys done on mothers. The clinical charts of those cases were also reviewed. According to the results obtained it was demostrated that age under 6 months represented a risk factor, no important difference according to sex were observed. The protein-energy malnutrition was not a problem. The poor administration of Exclusive Breast Feeding as well as the poor home conditions were another factor associated to diarrhoea diseases. For the statistical analysis the percentage mean and the Chi square hypothesis test were used. Key words : Acute Diarrheal Diseases,Epidemiologic factors, Protein - Energy Malnutrition, EXCLUSIVE BREAST FEEDING,M POOR HOME CONDITIONS.