Objective.To determine the prevalence of stress among Health Sciences students at Los Andes University (UANDES) and to compare subgroups according to gender, major, and year of college.To determine if there is a link between stress and infectious diseases.Methods.438 students from all seven years of Medical School and first year Nursing, Psychology and Dentistry students at UANDES.In October 2002 (test period) we administered a stress survey and checked for any symptoms of infectious disease during the previous 10 days.Results.We found a 36,3% stress prevalence, greater among women than men (p < 0,05).Medical students have significantly higher rates of stress than those in the other degree programs, and Psychology is the field of study with the least stress prevalence (p < 0,005).The first year of Medicine has significantly greater stress than the remaining years (p < 0,01).We found that stress is linked to infectious diseases (0,05).Conclusions.A significant percentage of Health Sciences students at UANDES suffer stress; it is therefore important to help them cope with stress and its causes.