About the book: 1979 / Author of the book, A. P. Karapata, Doctor of Medical Sciences, head of the Department of Therapy of the Poltava Medical Dental Institute. The reference book is listed in alphabetical order symptoms, syndromes and diseases. A brief description of them is given. The most common ones are presented with differential diagnostic criteria. The so-called rare diseases, the most difficult in diagnostic terms, are presented quite fully. The second edition is supplemented with 124 symptoms and syndromes. Attention is paid to some surgical, infectious, neurological and occupational diseases, which therapists often encounter at the initial stage of the diagnostic process. Auxiliary methods for studying patients are presented , used in the clinic of internal diseases. Their advantages within the limits of diagnostic capabilities are noted, which will facilitate the selection of adequate studies in each specific situation. The main purpose of the reference book is to assist the practitioner in diagnostic searches. It is designed for therapists and specialists in related disciplines. Reviewers: academician. Academy of Medical Sciences of the USSR A. I. Nesterov, K. I. Stepashkina.