Chronic abdominal pain in children can be dependent from motility disorders. The aim of the work was evaluation the frequency of changes in oesophageal manometry in children with chronic abdominal pain. Manometry studies were performed in 40 children with functional abdominal pain (group A, which was divided into subgroups: A1--functional dyspepsia, A2--irritable bowel syndrome, A3--nonspecific abdominal pain), in 11 children with gastritis (group B) and in 24 children as a control (group C). Disorders of lower oesophageal sphincter (LES) function were observed in 72.5% of group A and 45.5% of group B; transient lower oesophageal sphincter relaxations (TLESR) were noticed in 13.5%. Abnormalities of body function with the features of non-specific oesophageal motility disorders were observed in 62.5% in group A and 54.5% in group B during "dry" swallows and in 47.5% and 18.2% respectively during "wet" swallows. These changes were more frequent in dyspeptic children (85.7%). Statistical differences were established among values of resting LES pressure in analysed groups (group A or B versus group C; p < 0.05). In conclusion we mentioned that in oesophageal manometry abnormalities (LES and body function) were observed in children with functional abdominal pain and with gastritis. Characteristic features can not be defined in each group.