Burnout and physical health: an impact beyond the mind

Burnout is often perceived as a purely psychological disorder. The scientific reality shows a much broader impact, one that concretely affects the body, and the cardiovascular system in particular.

A systematic review published in 2017 in PLOS ONE (Salvagioni et al.) gathered studies that followed workers with burnout over time. It showed that burnout predicted a whole range of physical problems: coronary heart disease, hospitalizations for cardiovascular reasons, type 2 diabetes, high cholesterol, musculoskeletal pain, digestive disorders, prolonged headaches, respiratory infections, and even excess mortality before age 45. These studies remain observational, but their convergence is striking.

A link with cardiovascular risk that is increasingly well documented

According to the Fédération française de cardiologie (French Federation of Cardiology), burnout clearly increases cardiovascular risk, a conclusion supported by several independent studies. An Israeli study led by Sharon Toker, published in Psychosomatic Medicine in 2012, followed close to 8,800 apparently healthy people over several years. A high level of burnout was associated there with about a 40% increase in the risk of coronary heart disease, after accounting for other known risk factors. Among the most exhausted participants, the risk was nearly 1.8 times higher. The number of actual events remained limited, however, which means these figures should be read as orders of magnitude rather than precise estimates.

In Quebec, a team from Université Laval has been following a cohort of office employees since 2000. In a first publication, which appeared in 2023 in Circulation: Cardiovascular Quality and Outcomes, men exposed either to high job strain (heavy demands combined with little control over their work) or to an imbalance between the effort they put in and the recognition they received, had a 49% higher risk of coronary heart disease. Among those exposed to both at once, the risk was doubled — an effect comparable to that of obesity. Results among women were inconclusive. A second analysis of this same cohort, published in 2025 in JACC: Advances and covering close to 6,300 employees followed for 15 years, estimated that about one in five cases of coronary heart disease could be attributed to these work-related stress factors, with a substantial margin of uncertainty.

These two Quebec studies do not measure burnout itself, but rather the working conditions that encourage it. They show that chronic occupational stress takes a toll on the heart, whether or not the person feels exhausted.

The figures are consistent at a larger scale, too. In France, Inserm estimated in 2017 that about 3.5% of heart attacks could be linked to occupational stress, or 3,400 to 4,000 cases per year. In Europe, an Inserm team estimated in 2024 that about 8% of coronary heart disease cases and more than a quarter of depression cases could be attributed to psychosocial factors at work as a whole (job strain, effort-reward imbalance, job insecurity, long working hours, harassment), across 35 countries. At the global level, the WHO and the International Labour Organization estimated in 2021 that working weeks of 55 hours or more were associated with about 745,000 deaths from stroke or heart disease in 2016.

The mechanisms involved

The chronic stress associated with burnout keeps the body's stress-response system activated for a prolonged period, with measurable consequences: disrupted cortisol levels, chronic low-grade inflammation, and altered regulation of heart rhythm.

Faced with a one-off danger, the body reacts in two stages. The sympathetic nervous system releases adrenaline, which speeds up the heart and raises blood pressure. The hormonal axis connecting the brain to the adrenal glands releases cortisol, which mobilizes sugar and fat to supply energy. This response is perfectly suited to a brief threat. The problem arises when it stays switched on for months on end.

Several effects then add up. Blood pressure tends to stay higher, and it drops less at night. Blood sugar and blood fats rise, and sensitivity to insulin decreases, which explains the link with diabetes: in another study by the same Israeli team (Melamed et al., 2006), burnout was associated with a risk of type 2 diabetes nearly twice as high. Chronic low-grade inflammation sets in, measurable through markers such as C-reactive protein or fibrinogen, which promotes wear on the artery walls and the formation of blood clots. Heart rate variability, a reflection of the heart's ability to adapt, decreases. Over time, the cortisol rhythm itself can become dysregulated, to the point of sometimes becoming too low, which in turn worsens exhaustion.

Alongside these biological mechanisms, behavioral mechanisms matter just as much. A lack of time and energy often leads to moving less, eating faster and less well, smoking or drinking more, and sleeping less. Each of these behaviors is itself a cardiovascular risk factor, and it is their accumulation that accounts for burnout's long-term toll on health.

An impact that goes beyond the heart

Beyond cardiovascular risk, burnout is frequently accompanied by sleep disorders, digestive problems, a weakened immune system, and musculoskeletal pain (muscle tension, back pain). These very real physical symptoms rarely respond to purely symptomatic treatment as long as their underlying cause — chronic work-related stress — is not addressed.

Sleep holds a central place here, because it is both a victim and an amplifier. Stress disrupts falling asleep and causes early waking. The resulting lack of sleep in turn reduces the ability to manage emotions and to recover, which worsens the next day's exhaustion. The digestive system also reacts strongly to stress, with pain, bloating, altered bowel habits, or reflux, because the gut is closely connected to the brain through the vagus nerve and stress hormones. Prolonged muscle tension, especially in the neck, shoulders, and back, accounts for part of this chronic pain. Finally, prolonged stress reduces the efficiency of the immune defenses, which can show up as more frequent or longer-lasting infections.

These physical symptoms often lead people to see a doctor repeatedly for what seem like separate problems, without the connection to work ever being made. Bringing up one's work situation with a doctor, even without being asked, helps link these pieces together.

One more reason not to dismiss a high score

This link with physical health, and with cardiovascular health in particular, is one more reason to take a high burnout screening result seriously. What is at stake is not only psychological well-being, but also limiting a concrete and well-documented physical risk, in keeping with the overall prevention approach offered on Hygietest.

If your score is high, taking stock of your other cardiovascular risk factors is a worthwhile step, without any need for alarm. The hub's What is my cardiovascular risk?, Do I have high blood pressure? and What is my level of sedentary behavior/physical activity? tools can help with this. It is also reassuring to know that these effects are largely reversible: once the burden of stress decreases and sleep, physical activity, and regular eating patterns find their place again, blood pressure, blood sugar, and inflammation markers tend to improve.

To assess your own level of exhaustion, take the “Am I burned out?” test.