Stress
Organisations face enormous risks associated with the failure to identify stress and/or failure to do anything to reduce it. The continued build-up of casework or emails while someone is absent (especially if the absence is stress-related!) is easily avoided. The routine examination of every absence that is stress-related then taking mitigating action associated with it is likely to reduce time lost through absence and will show that the organisation is concerned for staff well-being.[see 'Absence Management']
Stress is a function of control ~ if someone feels that they are in control, they are less likely to suffer from stress, or, put the other way around, the less control a person has, the less able they are to deal with demand for their work.
"Too much to do, and not enough time to do it" is a combination of excess demand and lack of control, creating the 'helpless victim' mentality which can be eased through training in management techniques.