The philosophy methodology role in the doctor’s medical cognition and scientific worldview improvement is shown. The attention is focused on the doctor’s impossibility to think correctly not applying the major dialectic principles. The dialectics laws and categories are characterized and examples of applying them in the doctor’s practical activities are given. The importance of the dialectic method and systemic way of thinking for medical cognition and solving of the theoretical and clinical medicine fundamental problems is analyzed. The increasing role of the medicine and philosophy merging under conditions of the scientific and technical progress accompanied by a fast appearance of new scientific data is stressed.