Why Are More Kenyans Dying Suddenly From Heart Problems?

The death of Gloria Sekeiyan Khalwale, the wife of Kakamega Senator Boni Khalwale, has once again brought a troubling question into public conversation: why are apparently healthy Kenyans increasingly collapsing and dying suddenly?

Khalwale announced on Saturday that his wife had suddenly collapsed and died after what he described as a heart attack. Her death was unexpected, and no further medical details have been publicly disclosed.

Her death comes amid growing public anxiety about reports of sudden cardiac events involving people who, at least outwardly, appeared well.

Among the cases that have generated discussion is that of Kenyan journalist Nick Mudimba, who died at his home in Syokimau in March 2025 after collapsing. Mudimba, who had worked for CGTN Africa and previously KTN, was reported by The Star to have been unwell and to have received treatment shortly before his death. His family said he had been diagnosed with elevated uric acid levels. The precise cause of his death was not publicly established as a heart attack, and it would therefore be misleading to classify his death as one.

That distinction matters.

"Heart attack" and "cardiac arrest" are not interchangeable terms. A heart attack occurs when blood flow to part of the heart muscle is blocked. Cardiac arrest occurs when the heart's electrical system malfunctions and the heart stops pumping effectively. A heart attack can trigger cardiac arrest, but cardiac arrest can also result from abnormal heart rhythms, inherited heart conditions, cardiomyopathy and other causes.

The apparent increase in sudden deaths therefore needs to be examined scientifically rather than inferred from a collection of tragic individual cases.

Kenya's cardiovascular burden is already substantial.

The World Heart Federation estimates that cardiovascular diseases caused more than 32,000 deaths in Kenya in 2024. The organisation's data place cardiovascular disease among the country's major causes of death, reflecting a broader transition in which non-communicable diseases increasingly compete with infectious diseases as a cause of premature mortality.

The problem is not confined to old age.

A 2024 study involving patients at Aga Khan University Hospital in Nairobi examined acute coronary syndrome among young adults and found that young people represented a significant proportion of patients presenting with these serious heart conditions. More than half of the young patients in the study had a family history of premature cardiovascular disease.

The finding challenges one of the most persistent assumptions about heart disease: that it is predominantly an illness of elderly people.

Hypertension, diabetes, obesity, smoking, physical inactivity, unhealthy diets, excessive alcohol consumption, high cholesterol and genetic predisposition can all contribute to cardiovascular disease. In many cases, hypertension and high cholesterol produce no obvious symptoms until a major cardiovascular event occurs.

There is another factor that has complicated the conversation since 2020: COVID-19.

SARS-CoV-2 is not simply a respiratory virus. Evidence accumulated during and after the pandemic has shown that COVID-19 can affect the cardiovascular system, including through inflammation, blood-clotting abnormalities and injury to the heart muscle.

A 2025 systematic review and meta-analysis involving 54 studies and 32,500 patients estimated the prevalence of myocarditis at 1.2 per cent during acute COVID-19 and 7.4 per cent in the post-COVID period, although estimates varied substantially depending on how myocarditis was defined and detected.

This raises an important question for Kenya: how much cardiovascular damage may have gone undetected among people who recovered from COVID-19?

The answer is not yet known.

Kenya does not have sufficiently comprehensive national surveillance capable of establishing whether sudden cardiac death has increased above its expected baseline since the pandemic. Individual reports, social-media posts and obituary notices cannot establish such a trend.

But the scientific question is legitimate.

COVID-19 infection has been associated with myocarditis and other cardiovascular complications. Researchers have also investigated whether vaccination against COVID-19 could produce similar effects.

Here, the evidence becomes more nuanced.

The association between some COVID-19 vaccines and myocarditis is real. The World Health Organization has acknowledged that very rare cases of myocarditis and pericarditis occur after mRNA vaccination, particularly among younger males, usually within days of vaccination and more often after the second dose.

A 2025 review of more than 40 studies likewise found that vaccine-associated myocarditis occurs most frequently in young males and typically develops within days of vaccination.

That is a legitimate adverse-event signal and should not be dismissed.

But myocarditis is not synonymous with sudden cardiac death.

And this is where claims circulating online often go beyond the evidence.

A major CDC analysis published in 2024 examined deaths among previously healthy young people and found no evidence that COVID-19 vaccination was associated with an increased risk of sudden cardiac death. The investigators specifically concluded that the data did not support an association between vaccination and sudden cardiac death in previously healthy young people.

A 2026 population study published in PLOS Medicine reached a similar conclusion. Researchers examining apparently healthy people aged 12 to 50 found that their results did not support the hypothesis that COVID-19 vaccination increases the risk of sudden cardiac death.

There is, therefore, an important scientific paradox.

There is credible evidence that COVID-19 vaccines can rarely cause myocarditis. There is also credible evidence that COVID-19 infection itself can cause myocarditis and cardiovascular injury. But large population studies have not established that vaccination has produced a general increase in sudden cardiac deaths.

Indeed, some research suggests the cardiovascular risk associated with COVID-19 infection is greater than that associated with vaccination. A review published in the National Library of Medicine concluded that myocarditis risk was higher following COVID-19 infection than following mRNA vaccination.

That does not mean vaccine safety questions should be closed.

It means they should be investigated properly.

Kenya needs better data.

Every unexplained sudden death in a young or middle-aged person should not automatically be labelled a heart attack. Where circumstances permit, medical records, ECGs, cardiac imaging, toxicology, family history and, where medically and legally appropriate, post-mortem examination can help distinguish coronary disease from myocarditis, cardiomyopathy, arrhythmia and other causes.

The country also needs stronger surveillance of sudden cardiac death.

At present, a death may be recorded simply as "cardiac arrest", even though cardiac arrest is a mechanism of death rather than an underlying diagnosis. That creates a major epidemiological problem: if the underlying causes are not identified, researchers cannot determine whether the country is experiencing a genuine change in the pattern of sudden deaths.

The same problem affects the public debate around COVID-19 vaccines.

A person dying suddenly after receiving a vaccine does not establish that the vaccine caused the death. Equally, the temporal association should not automatically be dismissed without investigation.

The correct scientific question is: was the vaccine exposure associated with an excess risk beyond the background rate, after accounting for age, sex, previous infection, underlying disease and other cardiovascular risk factors?

That is a question epidemiologists, cardiologists and public-health authorities can answer with properly designed surveillance and linked health records.

For Kenya, the stakes are particularly high.

The country is already facing a cardiovascular disease burden that is killing tens of thousands of people annually. Research from Nairobi indicates that serious coronary disease is occurring in younger adults, while family history, hypertension and other conventional risk factors remain important.

The pandemic may have added another layer to that burden, through both the cardiovascular consequences of SARS-CoV-2 infection and the disruption of routine healthcare, screening and chronic-disease management.

What is missing is a national answer to the most basic question: are sudden cardiac deaths actually increasing, and if they are, why?

The death of Gloria Sekeiyan Khalwale is first and foremost a family tragedy. It should not be used to advance an unproven medical theory.

But tragedies such as hers can also expose gaps in public-health knowledge.

Kenya needs to move beyond anecdote.

If doctors are seeing more young patients with acute coronary syndromes, the country should document it. If unexplained cardiac arrests are becoming more common, that should be measured. If COVID-19 survivors have an elevated long-term cardiovascular risk, Kenyan studies should quantify it. If a particular vaccine or vaccine platform is associated with a rare cardiac complication, the adverse-event surveillance system should be capable of detecting it.

The evidence available today does not justify saying that COVID-19 vaccines are causing a wave of sudden deaths in Kenya.

Nor does it justify pretending that there are no cardiac questions worth investigating after the pandemic.

The more important story may therefore not be about vaccines at all.

It may be about a cardiovascular disease burden that was already growing, a younger population developing serious heart disease, undiagnosed risk factors, the long-term consequences of COVID-19 infection, weaknesses in emergency cardiac care — and a health system that still does not have enough data to explain every sudden death.

That is the conversation Kenya should now have.

Why Are More Kenyans Dying Suddenly From Heart Problems?

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