People absent from work because of illness are more likely to report a mental health condition than those at work, according to DWP statistics.
A survey of Fit for Work Service participants by the DWP found that three-quarters (73%) of respondents who were absent from work reported more than one health condition, with mental health illnesses being the most commonly reported secondary condition.
Almost half (44%) of those who said their main absence was due to a musculoskeletal disorder added that they had a mental health condition.
Meanwhile, absentees with a mental health condition were also more likely to report a non-health related barrier that was preventing them from returning to work.
The analysis conducted by Legal and General echoed figures by the CIPD which showed mental and behavioural disorders were one of the leading causes of absence.
Legal & General Group Protection managing director Diane Buckley said: "These findings suggest that absentees could be more likely to develop a mental health condition as a result of a long-term absence.
"This shows just how important it is for employers to have a supportive absence management strategy in place to support employees through their absence, and help them in their return to work."