[Modern views on the theory of nature (mizadj) by Ibn Sina in medicine].

On the basis of the theory of mizadj Ibn Sina advocates an individual approach to a person, regardless whether that person might be healthy or sick, infant or advanced in years, with taking account of a unique combination of all his/her inherences and concrete conditions of his/her living and activities, starting with which principles Ibn Sina suggests criteria for defining the notion "mizadj", each such criteria corresponding to a certain division in relevant lines of scientific inquiry. The teaching of Ibn Sina about mizadj at the present stage assumes ever greater importance in medicine both in diagnosis and treatment and in prophylaxis against diseases, which facts attest to the need for a thoroughgoing approach to the study of creative legacy of a great scientist.