The aim of this study was to analyze the predisposing factors for bronchiectasis in 69 patients hospitalized in the 3rd Dept. of the Institute of TB and Lung Diseases in Warsaw in years 1995-1999. Bronchiectasis was diagnosed on the basis of the high resolution computed tomography (HRCT) scan. Among 69 patients at the age of 15-72 years there were 45 women (65%) and 24 men (35%). Fifty patients were nonsmokers. The most frequent predisposing factors of bronchiectasis in that group of patients were as follows: pneumonia (30.1%, in it recurrent pneumonia--19.3%, a single pneumonia--10.8%), sinobronchial syndrome (19.3%), pulmonary tuberculosis (12.1%), nontuberculous mycobacterial lung infections (7.2%), recurrent pneumonia and bronchitis in childhood (7.2%) and connective-tissue diseases (3.6%). Among other predisposing factors there were allergic bronchopulmonary aspergillosis, foreign body in bronchus, hypogammaglobulinemia and colitis ulcerosa.