During the 20th century, tuberculosis has been the most prevalent and most harmful disease in Japan. Enormous medical researches have ever been performed to conquer the disease. Nevertheless tuberculosis has left various somatic and psychological residues on vast convalescents. On the other hand, researches to conquer tuberculosis have made considerable contribution to other fields of medicine. 1. Somatic and psychological residues on convalescents from tuberculosis. Chest x-ray findings, cardio-pulmonary disturbance, secondary infection, serum-hepatitis due to mass transfusion during the chest surgery, streptomycin-deafness and psychological disorder. 2. Sequelae of phthisiology. a. In the field of basic medicine. Respiratory physiology, immunology and genetic pharmacology. b. In the field of epidemiology. Methodology to control the disease. c. In the field of clinical medicine. Chest x-ray diagnostics, bronchoscopy, thoracoscopy, randomized controlled trial, regimens of chemotherapy, open chest surgery, anesthesiology, treatment of respiratory failure, informed consent, terminal care and cooperative study system. d. In the field of rehabilitation. Medical, vocational and social rehabilitation of the handicapped. e. In the field of public health. Comprehensive control system of the chronic disease. Smallpox has been eradicated, but the elimination of tuberculosis is still far away. Studies as excellent as past ones should intensively be carried out.