During the year ending April 2, 1982, 153 patients readmitted to a geriatric medical unit within twelve months of their previous discharge from any hospital in the district accounted for 24.8% of the 617 patients admitted. Readmission of the 153 patients was due to unavoidable clinical deterioration (32%), inadequate medical management (21%), non-compliance of patient (20.2%), social problems (18.3%), or inadequate rehabilitation (8.5%). Readmission could have been prevented in 73 (47.7%) patients. These figures emphasise the importance of greater medical interest in the problems of the aged and support the need for a higher consultant/bed ratio in geriatric medical units to allow more effective management of patients aged 75 years and over.