Investigations were conducted on learning problems using the sample of eighth-grade students of primary school (N=335). The respondents opted for one or more than seven offered statements related to: insufficient previous knowledge, insufficient studying, teaching contents (extensive, difficult unintelligible), textbook and teacher’s method of presenting the contents. On the basis of the results obtained, one-third of students have problems in mastering teaching contents of foreign language, physics and chemistry, and about one-fourth in mastering those of history and mathematics. All the mentioned causes of problems are present in varying degrees in some school subjects. The causes of learning problems are markedly present in a larger number of school subjects and they are related to some characteristics of teaching contents. Respondents point out, to a large extent, that teaching contents of technical education are uninteresting. In addition, students’ responses indicate that it is necessary to improve the method for mastering the teaching contents in various school subjects i.e. methods applied in the teaching process. Subjective causes, as pointed out by students, are connected with some of the subjects they have characterized as the most difficult. Unintelligible textbook is stressed to the lowest extent as a cause of learning problems compared to other causes stated for the majority of school subjects.