Based on the experience with gastric biopsies in a rural population of Colombia with very high rates of gastric cancer, a description of the dysplasias of the gastric mucosa is given. It recognizes two main types of dysplasias: hyperplastic and adenomatous. Different degrees of atypism are recognized within each category. A comparison with other classifications of gastric dysplasias is offered. A positive correlation of dysplasia with gastric juice nitrite is found and offered as an adjuvant to the evaluation of patients with this type of condition.