Introduction: Pediatric gastroesophageal reflux disease (GERD), has a high morbidity-mortality. The gold standard is the 24 hours pHmetry (pH24h). The objective is to determine the relation between symptoms and parameters of pH24h. Methods: Comparative, descriptive, and retrospective study. N=35 children <14 years old suffering GERD, from the HUV in Cali, Colombia. Data: name, age, gender, symptoms and stature were taken. They were divided into three groups: digestive, respiratory and mixed. They were classified as chronic undernourished (deficit height/age ¡Ý 5%) according to tables from the NCHS. From pH24h were taken: reflux index (RI), # of acid episodes, # of episodes >5¡− and duration of the longest episode and association with symptoms. The statistical analysis was the student’s t, having p<0.05 as significant. Results: 35 children were included (47.9–À41.3 months), 20 male, 2 with digestive symptoms, 17 with respiratory and 16 with both symptoms, with a deficit of H/A= −8.0–À10.89%. The parameters of pH24h were: IR 5.25–À4.94%; # of acid episodes 77.21–À78.96; # of acid episodes >5¡− 1.30–À3.67 and the duration of the longest episode 9.36–À20.06¡−. There were not significant differences between the parameters of pH24h and the study groups (p>0.05). The respiratory group showed pH24h parameters more involved: IR 4.75–À5.17%, # of acid episodes 79.17–À79.76, # of acid episodes >5¡− 2.29–À4.97 and duration of the longest episode 15.0–À27.04¡ −; the same as their nutritional status (p=0.003). Conclusion: There was no significant association between pH24h parameters and symptoms, however the group with respiratory symptoms had a higher compromise of the pH24h parameters and nutritional status.