Oral regression was studied in 12 peptic ulcer patients whose psychiatric diagnoses were 5 character neuroses, 5 obsessional neuroses, and 2 mixed psychoneuroses. Long-standing neuroses were present in these patients, and the ulcer, which was part of their neuroses, would appear when actual external conflicts met with and intensified their infantile conflicts. Oral-receptive and oral-demanding attitudes dominated their personalities and kept them immature. The character neuroses showed that their oral regression was due to strong oral fixation. In the obsessional neuroses and mixed psychoneuroses, the regression to orality was found to be due to a regression from an unresolved oedipal conflict. These emotionally impoverished people were intelligent and creative, yet dependent and unable to relinquish their first love object—mother. Ego-alien ideas caused an accumulation of tension with frustration. The inability to discharge their aggression outward caused an introjection of the rejecting mother and helped to produce their somatic and emotional suffering.