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The biggest health challenge of the 21st century – and how little we know about it

Despite the fact that the health needs of the global population have significantly changed in the past generation, the way in which health care is delivered has remained essentially the same.

In today’s post, Professor Stephen MacMahon and Dr Brendon Neuen outline why this lack of responsiveness is hindering the ability of health systems to meet our current care needs.

They also argue that this situation will worsen unless we undertake a ‘radical rethink’ of health system design and ‘transition to more people-centred health systems, characterised by high-value, integrated, and generalist care’.

This post was first published at Oxford University’s Medium site and is re-posted here in full with permission.


Stephen MacMahon and Brendon Neuen write:

In not much more than a generation, we have transitioned from a world in which infectious diseases were the greatest health challenge to one in which multiple chronic illnesses and disability are the biggest threat.

The implications for our health systems are massive, but not only are they alarmingly ill equipped to cope; we are facing a frightening lack of evidence on how they need to be adapted. If we don’t address this evidence gap – and quickly – we cannot hope to create health systems capable of delivering the comprehensive care patients so desperately need.

What do we know?

Populations are ageing; between 2015 and 2050, the proportion of people aged over 60 is projected to almost double, reaching around 2.1 billion. As a result, many more people are experiencing several diseases simultaneously – a phenomenon known as multimorbidity.

Most of our understanding of multimorbidity comes from high-income countries, where in primary care it is the norm rather than the exception. The number of people affected rapidly increases after the age of 65, but also disproportionately affects the poor and vulnerable. The financial costs associated with this are enormous; approximately 70% of healthcare spending in the United States is on people with two or more chronic conditions.

Similar trends are likely to be occurring in low and middle-income countries. In a snapshot study of Ghana, Mexico and four other countries, around 50% of people aged over 60 had two or more chronic conditions. But unique to these countries is the fact that these changes are occurring in the context of an existing burden of infectious diseases, maternal and child health problems and nutritional conditions, placing additional strain on already fragile or emerging health systems.

It’s clear that multimorbidity is not simply a problem for developed economies – it’s a huge and pressing global health problem.

What don’t we know?

Despite the scale and urgency of this global problem, we lack reliable data – particularly when it comes to younger adults and developing countries.

We don’t know why different conditions seem to ‘cluster’ together in patients; some of them share common risk factors, but others appear unrelated and even require discordant treatments. What is the burden of different clusters? What is their relative impact on disability and quality of life? And what are the modifiable risk factors for these clusters occurring?

We also know very little about how effective health services are at dealing with multiple chronic conditions in the same person. Most health systems around the world are designed around a single condition or body system, with ever-increasing sub-specialization by health professionals in recent decades. Dr Richard Smith, former editor of the British Medical Journal, memorably observed: “Doctors and patients are heading in opposite directions… Patients increasingly have multiple conditions, while doctors are specializing not just in organ systems, but in parts of organs.”

Not only this, but research that guides healthcare often exclude people with multiple chronic conditions, potentially limiting its applicability to an ever-diminishing number of people.

The need for a radical rethink

We need to confront this tension between increasing complexity and sub-specialization with our patients’ need for a more holistic approach. We need a radical rethink of our health systems. But we can’t redesign systems if we don’t fully understand the problem in the first place. The only way to change is through a deeper understanding of the phenomenon we’re facing – something we will only achieve through a concerted effort by researchers, funding bodies and governments.

The UK Academy of Medical Sciences’ highly anticipated report Multimorbidity: a priority for global health research sets out a number of key priorities. These include:

  • Standardizing definitions and classification systems for multimorbidity;
  • Detecting trends and patterns in multimorbidity, including clusters with the greatest burden;
  • Identifying risk factors for the most common clusters and strategies to prevent them;
  • Exploring strategies to best manage patients with multimorbidity, including how health systems can be reorganized to facilitate this.

In low- and middle-income countries, we have an opportunity to avoid excessive sub-specialization, and design systems better structured to deal with multimorbidity. One example could be integrated chronic disease clinics for commonly occurring combinations of conditions such as diabetes and tuberculosis. These clinics would also provide an opportunity to screen for other common chronic diseases.

Understanding our patients’ perspectives, as well as those of healthcare providers, will be crucial; particularly because multimorbidity increases the demands of care, while reducing individuals’ capacity to manage their care themselves.

With better insight into the complex interactions between different chronic conditions, we could design systems that capitalize on opportunities to provide care for coexisting conditions. Only by gaining a real understanding of the causes and consequences of the tidal wave of multimorbidity that confronts us will we be able to respond effectively and transition to more people-centred health systems, characterised by high-value, integrated, and generalist care.

Professor Stephen MacMahon AO is Chair of the Academy of Medical Sciences multimorbidity working group and Principal Director of The George Institute for Global Health.

Dr Brendon Neuen is a Medical Registrar at Royal Prince Alfred Hospital, Australia and PhD Scholar at The George Institute for Global Health.

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