Introduction: The problems of problem learners hare not been systematically demonstrated. The purpose of this study was to summarize the English expression and definition of problem learners and classify factors associated with problems.

Method: A systematic literature review was conducted.

Results: The expressions extracted were disability, learning disorders, at-risk, difficult, problem, struggle, underperform, unprofessional, unsafe, gifted, and outstanding. Factors associated with the problems were classified into learners' characteristics, cognition, attitude, and skill.

Discussion: These findings will help teachers understand and detect the problems of problem learners appropriately.