Mental Health and the Cost of Toxic Corporate Culture

Let me say this plainly: toxic corporate culture makes people sick. Not metaphorically. Physically and psychologically sick, in ways that persist long after the person has left the environment. And yet most organisations treat this as a wellness problem rather than a leadership one.

The numbers in South Africa are stark. According to research from the South African Depression and Anxiety Group published in 2025, 52% of respondents had been officially diagnosed with a mental health condition, with depression at 32%, clinical stress at 25%, anxiety at 18%, and burnout at 13%. Mental health-related productivity losses cost South African organisations R161 billion per year. Unplanned absenteeism alone costs another R25 billion annually. The number of South Africans seeking psychiatric or psychological treatment tripled between 2012 and 2024.

These are not numbers you explain with individual susceptibility. Something is happening in the environments people are working in.

Related operating context: Mental Health Is a Leadership Issue, and Companies Need to Stop Pretending Otherwise, How Culture Dies in Big Companies, When the Leader Is the Toxin.

What toxicity actually is

Toxic corporate culture is not about difficult targets or high pressure. Pressure, expectation, and genuine challenge are legitimate parts of professional life. The best people often want them.

Toxicity is something specific. It is an environment where leader behaviour is unpredictable enough that people spend significant cognitive energy managing their own exposure. Where honest communication is punished, overtly or subtly. Where people are rewarded or penalised based on relationship dynamics rather than performance. Where leadership is used as a vehicle for personal power rather than organisational purpose.

In a toxic environment, a person cannot do their best work because doing their best work is not what the environment is optimised for. The environment is optimised for self-protection. And the energy consumed by self-protection is energy no longer available for the work itself.

According to a 2025 survey cited by Speakwise Toxic Workplace Statistics, 80% of workers reported working in a toxic environment, up from 67% the year before. SHRM research found that toxic workplace cultures cost US companies over $223 billion in the decade to 2025 due to employee turnover alone. South Africa faces the same dynamic, even if the local data is harder to aggregate.

The physiological reality

Chronic workplace stress is not a metaphor. Sustained exposure to an environment where a person feels psychologically unsafe activates the same physiological stress responses as physical threat. Cortisol remains elevated. Sleep is disrupted. Immune function is suppressed. The nervous system stays in low-grade alert, sometimes for years.

Over time this produces real health consequences: burnout, anxiety, depression, and physical illness at rates measurably higher in people who work in toxic environments than in those who do not.

The SIOPSA research and the SA Journal of Industrial Psychology have documented this pattern locally. Over 36% of South African employees experience daily stress. Over 71% are disengaged at work. Nearly 38% feared job loss in recent survey periods, and close to one in five absorbed the responsibilities of resigned colleagues without any additional support or recognition.

These are not numbers that point to personal fragility. They point to organisational conditions.

Why individuals don't name it

Most people experiencing this do not describe it as a work-related health issue. They internalise it. They question their own competence, their resilience, their suitability for the role. The environment, often deliberately, has taught them to do this.

That internalisation matters because it delays help-seeking, prevents honest conversations with leadership, and allows the conditions to persist. The person struggling in a toxic environment typically blames themselves before they blame the environment. And the organisation benefits, for a while, from that misattribution.

Globally, 56% of leaders reported burnout in 2024, rising to 77% by 2025. The problem is not limited to junior employees. It travels up the structure, which means the people who most need to address the conditions are often the ones most depleted by them.

The leadership responsibility

Leaders create the conditions in which people work. The tone, the norms, the behaviours that are tolerated and those that are not, these are leadership decisions, whether made consciously or not.

A leader who uses fear as a management tool, who creates unpredictability to maintain control, who punishes honest feedback and rewards deference, is not leading. They are causing harm. The fact that the harm is invisible in the way a physical injury is not does not make it less real. According to the PwC 2024 Trust Survey, 22% of employees left a company specifically due to trust issues, and 61% said the perceived lack of trust from leadership directly impacted their ability to do their jobs well.

The connection between leader behaviour and workforce mental health is not theoretical. It is a documented, measurable relationship.

What has to change

Wellness programmes are not the answer to this, not as the primary response. They treat the symptom while leaving the cause intact. An EAP does not change what happens in the 9am meeting when someone raises a problem and the leader makes an example of them.

The organisations that produce different outcomes take the psychological wellbeing of their people seriously as a leadership accountability, not a wellness function. They measure it. They hold leaders responsible for the conditions they create. They act on what they find, even when what they find is inconvenient.

If you are working in a toxic environment right now, the first thing to recognise is that the problem is not you. The second is that prolonged exposure is not a rite of passage. It is a real risk to your health, your confidence, and your long-term capability. Leaving is not failure. Protecting your capacity to lead well in the future matters to more people than just yourself.

The industry of senior leadership needs honest conversations about what working in broken organisations actually does to people. The data is there. The human cost is there. The only thing missing is the leadership will to act on it.

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Sources

• Gallup: State of the Global Workplace 2024; employee wellbeing and engagement research.

Last verified: June 2026