A second argued: “Because these days you have to overwork yourself if you want to do anything other than pay your bills.”
Another wrote: “Worst pension in Europe. Worst sick pay in Europe. Connect the dots.”
However, the study showed stress was high on the list of reasons.
Work-related and cost-of-living pressures also made the cut.
Minor illnesses were the main factor behind short-term absences.
Three-in-four respondents had been off work due to stress over the past year.
Workers walking through the city
Almost two-in-three long-term absences were blamed on mental health issues.
Over a third of firms also reported COVID-19 remained a significant cause of short-term absence.
The analysis corroborates recent data compiled by the Office for National Statistics (ONS) earlier this month.
The ONS found that more than 2.6 million people do not have jobs due to their health.
Rachel Suff, senior employee wellbeing adviser at the CIPD, said: "External factors like the COVID-19 pandemic and the cost-of-living crisis have had profound impacts on many people's wellbeing.
"It's good to see that slightly more organisations are approaching health and wellbeing through a stand-alone strategy.
A stock image of an office meeting
"However, we need a more systematic and preventative approach to workplace health.
"This means managing the main risks to people's health from work to prevent stress as well as early intervention to prevent health issues from escalating where possible."
Claudia Nicholls, chief customer officer at Simplyhealth added: "With record numbers of people off sick, employers have a vital role to play in supporting them through workplace health and wellbeing services.
"They can have a positive impact on the economy and ease pressure on the NHS.
"Despite an increasing number of workplace health and wellbeing services being put in place, employees are experiencing increasing mental health issues and the highest rate of sickness absence in a decade.
"However, focusing on fixing sickness alone is unlikely to uncover areas where any significant improvements can be made; companies need to implement preventative health and wellbeing strategies that are supported by the most senior levels of leadership and build line manager skills and confidence to support wellbeing."