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Stress in Horses — The Silent Root Cause Nobody Is Talking About

When we talk about horse health, we talk about feed. We talk about veterinary care. We talk about exercise and farriery and dentistry.

What we rarely talk about — and what I believe is one of the most significant and most overlooked root causes of chronic health problems in horses — is stress.

Not the short-term stress of a fright or a loud noise. The body handles that well. It is designed to.

The kind of stress I mean is chronic, low-grade, ongoing stress. The kind that is woven into the fabric of a horse's daily life. The kind that never fully switches off. The kind that the body was absolutely not designed to sustain indefinitely.

This kind of stress changes everything.
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What Chronic Stress Does to the Horse's Body

When a horse experiences stress, the body activates the HPA axis — the hormonal stress response — releasing cortisol and adrenaline. The heart rate increases. Blood is redirected to the muscles. Digestion slows. The immune system is temporarily suppressed.

This is the fight-or-flight response. In acute situations, it is lifesaving.

But when stress is chronic — when the triggers never go away — the body is running this response at a low level continuously. And the consequences are profound:

Gut health deteriorates. Chronic stress reduces blood flow to the digestive system, disrupts the gut microbiome, increases intestinal permeability, and directly contributes to conditions including ulcers, colic, and dysbiosis.

The immune system is suppressed. Chronically elevated cortisol suppresses immune function — making the horse more susceptible to infection, slower to heal, and more vulnerable to inflammatory conditions.

Inflammation increases. Chronic stress is a powerful driver of systemic inflammation — the same inflammation that underlies EMS, laminitis risk, joint disease, and metabolic dysfunction.

Weight regulation is disrupted. Cortisol directly promotes fat storage, particularly around the neck and abdomen. The chronically stressed horse may gain weight or struggle to maintain healthy weight regardless of what is in the feed bucket.

Behaviour changes. The horse's nervous system, under chronic cortisol load, becomes hypervigilant and reactive. What looks like a training problem, a personality issue, or "just the way this horse is" may be a stressed nervous system that has never had the opportunity to come back to baseline.

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The Stress Factors Most Owners Never Consider

Standing Alone in the Paddock

Horses are herd animals. This is not a preference — it is a biological imperative. In the wild, a horse alone is a horse in danger. The nervous system of a solitary horse is in a state of chronic low-level alert — scanning for threats, unable to truly relax, because relaxation when alone represents vulnerability.

A horse kept alone — even with visual contact with other horses, orbeing able to touch other other horses over the fence (often eletric fence) or the are capable to touch each other's noses in the stalls, is not a thriving life for a horse — is experiencing a form of chronic stress that affects every system in the body. The health consequences are real and measurable.

No 24/7 Access to Forage

This is one of the most significant and most underestimated stress factors in modern horse management.

The horse's digestive system is designed for near-continuous grazing — producing stomach acid continuously, regardless of whether food is present. When a horse has long gaps without forage, that acid has nothing to buffer it. Ulcer risk rises dramatically. Gut dysbiosis increases. And the horse enters a state of hunger-related stress that — if repeated daily — creates a chronic stress load on the body.

A horse without access to forage is, from a biological perspective, a stressed horse. Every hour without hay is an hour of physiological stress. In nature, they always have access to food 24/7 — they are designed that way, and therefore the body becomes stresses down to a cellular level when they are deprived of access to forage /grass  around the clock. 

Herd Dynamics and Social Conflict

Not all herd situations are equal. A horse in a paddock with incompatible companions — being chased, bullied, or prevented from accessing food and water — is living in chronic social stress. If this is the case, then as a owner you need to find another solution - one where the horse still has pasture companions, but with horses it truly thrives with. And yes, sometimes that may mean moving to another stable to find the right enviroment where the horse can thrive. But isn't that worth it. To see the horse truly happy and thriving. Standing alone is not wellbeing, nor is it in the horse's best interest.

The horse that "always seems anxious" or "never fully relaxes" may simply be living in a social environment that does not feel safe.

Moving Stables — Especially Alone

For a horse, being moved to a new stable — away from familiar companions, familiar smells, familiar routines — is genuinely disorienting and stressful. The stress is amplified enormously when the horse moves without any familiar companions.

New horses in a new environment, with new social hierarchies to navigate, new smells, new sounds, new people, new rutines — this is a significant stress event. Many horses take weeks or months to fully settle. During that time, the physical health consequences of the stress are real. So please be patient and give the horse the time it needs to settle. 

The Energy of the Yard

This is something that is rarely talked about — but that I observe consistently in my work.

Horses are extraordinarily sensitive to the emotional and energetic environment around them. A yard/stable where people are stressed, rushed, harsh in their interactions, or where there is conflict and tension — that energy is felt by every horse in that yard.

A horse cannot separate the emotional environment of its living space from its own internal state. What happens around them, shapes what happens inside them.

The Owner's Emotional State

This may be the most profound and least acknowledged stress factor of all.

Research consistently shows that horses read human emotional states with remarkable accuracy — heart rate variability, cortisol levels, body language, micro-expressions. A horse whose owner is going through significant stress — a divorce, a bereavement, a difficult period at work — often mirrors that stress in their own body.

This is not me saying you shouldn't be with your horse - quite the opposite, as their company often helps us humans heal faster than we are even aware of.

What I am saying is that  this is a part of life, but also something we need to remember when we train or spend time with our horses. They may suddenly change or do the opposite of what we ask if we are not fully present in the moment. 

Maybe you kno the feeling of the riding while you've just had a discussion with someone or need to buy food on the way home ect. — You can't fully let it go. Your horse can feel it. They know you are not completely present — and yet people often still expect them to perform as if they are.

So just a kind reminder: If you are in your head, you are not fully present with your horse, and that can sometimes be reflected back in ways you didn't expect or want. 

The horse that "suddenly" developed health problems during a difficult period in the owner's life may not be a coincidence. It may be a mirror.

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What Helps — The Holistic Approach to Stress

Addressing chronic stress in horses requires looking at the whole picture:

Forage access: 24/7 access to appropriate forage or grass is non-negotiable for a horse's physical and psychological wellbeing. This is the single most impactful change many horse owners can make.

Companionship: Where possible, horses should have genuine companionship — not just visual contact. If the yard situation doesn't allow full herd turnout, which is sadly the reality of many horse places today, even part-time companionship makes a significant difference.

Routine: Horses thrive on predictability. Consistent feeding times, consistent turnout patterns, consistent human interactions — all reduce the background stress load.

Nutritional support for the stressed nervous system: Magnesium, in particular, plays a central role in nervous system regulation. Many horses in modern management are significantly deficient. Targeted supplementation makes a measurable difference to anxiety and reactivity.

Cellular support: ASEA supports the cellular repair processes that chronic stress disrupts — including the restoration of normal gut lining integrity, immune function, and cellular communication.

Approach and training: Working with methods that build confidence, that listen to what the horse communicates, that prioritise genuine relaxation over compliance — this is not just kinder. It is measurably healthier for the horse's body.

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The Body Always Tells the Truth

I believe that every horse is trying to communicate, every single day.

Through their behaviour. Through their body condition. Through their health challenges. Through the way they hold their body, the way they interact, the way they respond to being approached.

When we learn to listen — really listen — the messages become clear. And when we address what they're telling us — including the stress — the body responds in ways that consistently astonish people.

→ The Overweight Horse Program — addresses the metabolic consequences of chronic stress alongside root cause nutrition.

→ The Ultimate Feeding Plan — the nutritional foundation that supports nervous system health and stress resilience.

→ Homemade Horse Treats — nourishing, low-stress additions to your horse's day.

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