Our article deals with social conflicts in “troubled” schoolchildren from the perspective of their teachers. Using Behaviour Assessment System for Children – Teacher Rating Scale (Czech method), a total of 92 schoolchildren have been tested. All the children were identified by their teachers as having behavioural difficulties. The children with behavioural difficulties have been found to engage especially in peer-related social conflicts, which involved negative relationships with classmates and aggressive behaviour, particularly in the younger children (1st to 5th grade of compulsory education). The relevant personality traits included a higher tendency to lie, higher levels of emotional reactivity, and a negative attitude towards one’s own behaviour. Based on the results, a recommendation is given to teachers working with children with behavioural difficulties, to aid prevention and render psychological counselling.