Depression appears to be common after stroke, and therefore may have a bearing upon rehabilitation. To examine whether the depression is due to a specific brain lesion, or is reactive to the consequent disability, this study looked at the frequency and associations of depressed mood in a stroke rehabilitation unit in-patient population, unselected for site of lesion. Depression affected 50% of the patients; history of previous psychiatric disorder and cerebrovascular accident appeared to be important risk factors. There were hemispheric differences in the relationships between measures, with both the site-of-lesion and reactive viewpoints being upheld.