Goals This study aimed to analyse the association, commonalities and differences between obesity and eating disorders (ED). Method A total of 150 female patients [50 obese with bulimia nervosa (OB + BN), 50 obese with binge eating disorders (OB + BED), 50 obese without eating disorders (OB)] and 50 female healthy‐eating/weight control (CG) volunteers participated in this study. Assessment All participants were assessed by the Eating Disorders Inventory‐2 (EDI‐2), the Symptom Checklist‐Revised (SCL‐90‐R) and the Temperament and Character Inventory‐Revised. Results In general, all the groups differed significantly and showed linear trends (OB + BN > OB + BED > OB > CG) on general and eating psychopathology (SCL‐90‐R and EDI‐2). Regarding personality traits, statistically significant differences across all four groups were found on Harm Avoidance and Self‐Directedness. Whereas some symptoms were shared in extreme weight conditions, others were specifically related to ED. Conclusions The presence of binge and purge symptomatology in obese patients is clinically relevant. These findings help to understand the relationship between Obesity and ED. Copyright © 2013 John Wiley & Sons, Ltd and Eating Disorders Association.