Previous research involving individuals facing chronic health problems suggests that an attentional style characterized by pronounced monitoring of threat-relevant information is associated with poorer behavioral and emotional adjustment. This study examined the hypothesis that a pronounced monitoring style would be associated with poorer medical regimen adherence in a sample of 51 chronic hemodialysis patients. Hierarchical regression analyses (controlling for demographic factors and trait anxiety) revealed that "high monitors" exhibited higher interdialysis weight gains and higher serum K values reflecting poorer adherence to fluid-intake and dietary restrictions. However, monitoring was not associated with a measure of medication adherence. Partial support was found for a model suggesting that a lack of perceived control is responsible for the relationship between higher monitoring and poorer adherence.