Hi, Hiatus hernia is a condition where the gastro-esophageal junction comes above the diaphragm (cause injury or weakness) Usually it is below. 95% are sliding type as mentioned above. In 5% of cases instead of the junction some part of stomach may come above the diaphragm which is called rolling type. Symptoms of this condition (which is one of the GERD) depends on the competence of the lower esophageal sphincter LES. Obesity and stress may increase the symptoms. Grade ll LES Lax indicates the competency. usually it small as the case like you. Preventing the condition to get worsened is to follow the advise given by your dr. Medications that reduce the lower esophageal sphincter (LES) pressure should be avoided. Antisecretory drugs like proton pump inhibitors and H2 receptor blockers can be used to reduce acid secretion. Surgery is rarely indicated (if complaints become severe) So no worry Best wishes