What do we really mean by root cause?

“Root cause” has become one of the most widely used phrases in health and wellness. Sounds great, but what are we actually talking about?

It appears across functional medicine and conversations around weight loss, PCOS, food intolerances, fatigue, IBS, and other chronic symptoms. Everyone promises to “treat the root cause.” For most people, it suggests there is a single underlying issue that, once identified, explains and resolves symptoms.

It is encouraging that both practitioners and clients are looking beyond surface-level issues and asking deeper questions about health. But there is also a risk that what we call a “root cause” is sometimes simply the next identifiable layer:

• a hormone imbalance becomes the root cause
• a bacterial overgrowth becomes the root cause
• blood sugar dysregulation becomes the root cause

These findings matter, but sometimes they reflect something broader happening within the body, rather than a single starting point. In practice, many chronic symptoms are shaped by several interacting systems over time.

Weight loss: looking beyond food

At a basic level, weight change is still governed by energy balance. For this reason, many practitioners begin exploring the physiological factors influencing appetite, cravings, metabolism, and eating patterns. Hormones, sleep, blood sugar regulation, medications, and the microbiome are all commonly described as “root causes” influencing how the body responds. These factors matter and can significantly influence both behaviour and physiology.

At the same time, many practitioners and clients recognise that knowledge alone is rarely the issue. Most people already understand the basic principles of weight management:

• eating enough protein
• reducing ultra-processed foods
• limiting excess snacking
• moving regularly
• becoming more aware of portions
• reducing excess alcohol intake

The difficulty is often not information, but consistency over time. This is where the conversation often shifts from: “What should someone eat?” to: “Why is it difficult to consistently do the things they already know would help?”

At this point, emotional eating, coping strategies, reward patterns, self-sabotage, stress, and identity around food are often described as the “real” root causes. That shift moves the conversation beyond physiology and also beyond discipline and willpower, and towards understanding the emotional and behavioural patterns shaping someone’s relationship with food. But even this may not be the full picture.

For many people, both physiology and behaviour are influenced by the overall state of the nervous system and the pressures the body has adapted to over time. Food can become one of the few reliable ways to create relief, comfort, or regulation in a system that rarely feels fully settled.

Hormone balance: why is the body responding this way?

Hormone health is another area where “root cause” language is common. Low progesterone, elevated cortisol, insulin resistance, thyroid dysfunction, or oestrogen imbalance are often positioned as the root cause of symptoms. These imbalances are real and deserve appropriate investigation and support. Hormones influence energy, mood, sleep, digestion, inflammation, metabolism, and reproductive health.

At the same time, hormones are highly responsive to the wider environment within the body. Sleep disruption, chronic stress, under-eating, over-exercising, emotional strain, and ongoing physiological pressure can all influence hormone signalling over time. The endocrine system does not operate separately from the rest of the body.

In some cases, what we call a hormonal “root cause” may itself reflect a longer-term pattern of adaptation within the body. A body exposed to ongoing pressure will regulate differently from one experiencing more stability, nourishment, and recovery.

Gut health: the gut–nervous system connection

The same pattern appears in gut health. Many people are now familiar with terms such as dysbiosis, bacterial overgrowth, low diversity, inflammation, or candida. These findings can absolutely contribute to symptoms and may form an important part of the picture. These imbalances are often described as the root cause of digestive symptoms. But it is also worth asking why the digestive system may have become more vulnerable or reactive in the first place.

Digestion is closely linked to the nervous system. Sleep, stress, pace of life, emotional state, routine, and overall physiological load all influence how efficiently the gut functions. For some people, symptoms begin after illness or antibiotics. For others, they worsen gradually during periods of chronic pressure, overwhelm, hypervigilance, or emotional strain.

Many people with ongoing digestive symptoms describe years of pushing through exhaustion, eating quickly, ignoring hunger or fullness cues, remaining in a constant state of responsibility, or struggling to fully switch off. Over time, this can influence motility, sensitivity, inflammation, microbial balance, and the gut’s ability to repair and regulate itself effectively.

This does not suggest that symptoms are “all in the mind,” nor that physiology should be reduced to stress alone. Rather that digestion, hormones, immune function, behaviour, and the nervous system are closely interconnected, constantly influencing one another in both directions.

A broader understanding of root causes

None of this means that testing, nutrition, supplements, or physiology are unimportant. They often play an essential role in helping people understand what is happening within the body and begin to feel better. But symptoms and their “causes” are not always fully explained through biomarkers, diagnoses, psychological labels, or behavioural frameworks alone. More often, what we identify is the clearest explanation within a particular lens, rather than the full picture. 

The body reflects lived experience. Long periods of stress, emotional suppression, over-responsibility, perfectionism, disrupted rest, chronic busyness, or disconnection from bodily signals can all shape physiology over time. This may partly explain why some people feel frustrated when the next supplement, protocol, or elimination diet still leaves them feeling stuck.

When a wider view is taken, and context becomes clearer, symptoms often begin to make more sense. Not simply as isolated problems to eliminate, but often as part of a body adapting to ongoing load in the best way it can.

There is nothing wrong with looking for root causes. I have used this language myself. But perhaps a more useful question is not: “What is the one root cause?” Instead, it may be: “What systems, experiences, behaviours, and physiological patterns are interacting to shape someone’s health?” This broader way of thinking is often where more personalised and meaningful support begins.

What you can take from this

When you hear the phrase “root cause”, it may help to consider whether it reflects the beginning of the story or simply the most visible layer. Recognise that the nervous system, hormones, digestion, immune system, behaviour, and emotional experience constantly influence one another. Health rarely sits within one isolated system alone.

If your symptoms feel layered, persistent, or difficult to understand, working with a nutritional therapist can offer a more complete and individualised approach. Rather than focusing on a single “root cause,” with fixed protocols and plans, many are able to explore the interaction between physiology, behaviour, and the deeper patterns shaping your health.