March 2026
Anxiety is often described as overthinking or excessive worry, but anyone who has experienced it knows it goes far deeper than thoughts alone. It can affect sleep, digestion, energy levels, immune health and even fertility. In this article, I explore what anxiety really is, how it impacts the body and brain, and what you can do to regain balance…
How anxiety affects the body
Anxiety is often spoken about as though it exists only in the mind. We describe it as worry, overthinking or feeling on edge. Yet anyone who has lived with persistent anxiety knows that it is not simply a collection of thoughts. It is a whole-body experience. It can tighten the chest, churn the stomach, disturb sleep and leave a person utterly exhausted. As a Solution Focused Hypnotherapist, I see every day how closely the mind and body are intertwined, and how understanding the neuroscience of anxiety can be both reassuring and empowering.
In the UK, anxiety disorders are among the most common mental health difficulties. According to Mind, around one in six people report experiencing a common mental health problem such as anxiety in any given week in England. That is not a small minority. It reflects something deeply human about how our brains are wired to respond to perceived threat.
What anxiety actually is
At its core, anxiety is a survival response. It is driven by a small almond shaped structure in the brain called the amygdala. The amygdala acts as an alarm system. When it detects danger, whether that danger is physical or social, it signals the hypothalamus to activate the sympathetic nervous system. This sets off the familiar fight, flight or freeze response.
Adrenaline is released within seconds. Heart rate increases. Breathing becomes faster and shallower. Blood is diverted away from digestion and towards the large muscles of the arms and legs. Shortly afterwards, cortisol is released from the adrenal glands to keep the body on high alert.
This response is not faulty. It is ancient, automatic and designed to keep us alive. The difficulty arises when the brain begins to interpret everyday situations as threats. Deadlines, social situations, financial concerns or health worries can all trigger the same biological cascade that would once have been reserved for escaping a predator.
Anxiety therefore is not weakness or overreaction. It is the nervous system doing its job too often and sometimes too intensely.
The symptoms people experience
Because anxiety is driven by the nervous system, its symptoms are physical as much as psychological. People often report a racing heart, dizziness, sweating, trembling or a tight feeling in the throat or chest. Some experience tingling in the hands and feet due to changes in carbon dioxide levels caused by rapid breathing. Others describe nausea, irritable bowels or a loss of appetite.
Sleep disturbance is extremely common. When cortisol levels remain elevated into the evening, it becomes harder to drift into deep, restorative sleep. The brain remains vigilant, scanning for potential problems even in the quiet of the night.
Cognitively, anxiety can narrow attention. The prefrontal cortex, the part of the brain responsible for rational thought and decision making, becomes less effective when stress hormones are high. This is why anxious thinking often feels repetitive and difficult to control. The brain is prioritising survival over reflection.
Over time, this can create a vicious cycle. Physical symptoms reinforce fearful thoughts. Fearful thoughts trigger more physical symptoms. The person may begin to avoid situations that provoke anxiety, which can shrink their world and reinforce the belief that those situations are genuinely dangerous.
More than a state of mind
One of the most important messages I share with clients is that anxiety is not just in your head. It is a measurable, physiological state.
Chronic activation of the stress response has been linked to increased inflammation in the body. Elevated cortisol over long periods can affect immune function, making individuals more susceptible to infections. Research has also shown associations between long-term anxiety and gastrointestinal disorders such as irritable bowel syndrome.
The gut and the brain are in constant communication through the vagus nerve and a complex network of chemical messengers. When someone is anxious, this gut brain axis becomes disrupted. This helps explain why so many people experience digestive discomfort alongside persistent worry.
Cardiovascular health can also be affected. While short bursts of increased heart rate are harmless in healthy individuals, sustained stress may contribute to raised blood pressure over time. The body is not designed to remain in emergency mode day after day.
Even pain perception can change. Anxiety can lower the threshold at which the brain interprets sensations as painful. Muscles held in chronic tension may lead to headaches, jaw pain or back discomfort.
Other physiological symptoms may include skin issues such as eczema or psoriasis, which flare up or worsen due to the body’s inflammatory response.
Chronic stress can disrupt biological processes such as conception, resulting in reduced fertility for both men and women. In women, the rise in cortisol can suppress or disrupt the hormones responsible for ovulation, whilst in men, it may lower testosterone and interfere with sperm concentration and motility.
Providing there are no underlying physical causes, weight management difficulties are often the result of a body that is dealing with an overload of stress. A more detailed look at the impact of stress on weight loss can be found in my January blog.
It goes without saying that anxiety and stress can have a huge impact on sleep, from difficulty falling asleep to night-time wakings, vivid dreams, restlessness, night sweats, teeth-grinding and more. Without the restorative benefits of a good night’s sleep, we are more likely to be tired and irritable, which adds to our anxiety in a vicious spiral.
These symptoms are not a result of worrying thoughts. They are the body’s logical response to prolonged activation of survival circuits.
How anxiety shapes behaviour
Anxiety doesn’t just create unpleasant sensations. It influences behaviour in subtle and powerful ways.
Avoidance is one of the most common patterns. If the brain has linked a particular situation with threat, it will encourage withdrawal. This might mean declining social invitations, procrastinating over important tasks or seeking constant reassurance from others.
In the short term, avoidance reduces anxiety. The relief felt when cancelling an event or putting off a difficult conversation reinforces the behaviour. The brain learns that avoidance equals safety. Unfortunately, this also prevents new learning. The person does not get the opportunity to discover that they could cope.
Anxiety can also drive perfectionism and overworking. If the mind believes that mistakes are dangerous, it will push for constant checking and excessive preparation. This can lead to exhaustion, which in turn reduces resilience and increases vulnerability to further anxiety.
Why it can be difficult to address
Many people become frustrated with themselves for not simply thinking their way out of anxiety. Understanding the neuroscience helps explain why that is rarely effective.
When the amygdala is highly activated, it can override the more rational prefrontal cortex. Logic alone struggles to calm a nervous system that is primed for survival. Telling yourself there is nothing to worry about does not always switch off a biological alarm.
There can also be a degree of secondary fear. People begin to fear the symptoms themselves. A racing heart is interpreted as a sign of impending catastrophe. This meta-anxiety strengthens the original response.
Societal pressures may add another layer. In the UK, despite increasing awareness, many still feel reluctant to speak openly about anxiety for fear of judgement. This can lead to isolation, which deprives the brain of the soothing effects of social connection.
Practical steps to manage anxiety
The encouraging news is that the brain is plastic. It can change. New neural pathways can be formed with repetition and intention.
Regulating breathing is one of the simplest ways to influence the nervous system. Slow, diaphragmatic breathing stimulates the parasympathetic nervous system via the vagus nerve. This helps to reduce the heart rate and signals safety to the brain.
Sleep hygiene is crucial. Prioritising a consistent bedtime, reducing screen use in the evening and allowing time to wind down supports the natural rhythm of cortisol and melatonin.
Physical activity has strong evidence behind it. Regular moderate exercise has been shown to reduce symptoms of anxiety, partly through the release of endorphins and partly by metabolising excess stress hormones.
Attention training can also help. Gently redirecting focus towards neutral or positive aspects of experience strengthens neural networks associated with safety and problem solving. Over time, this can reduce the brain’s bias towards threat.
Connection matters deeply. Talking with trusted friends, family or professionals can dampen the stress response. Human beings are social creatures, and our nervous systems co-regulate with those around us.
How Solution Focused Hypnotherapy can help
As a Solution Focused Hypnotherapist, I work with the understanding that anxiety is rooted in the brain’s threat system. Rather than analysing the past in depth, we focus on building preferred futures and activating the rational, solution-focused parts of the mind.
In trance, which is a natural and safe state of focused attention, the brain becomes more receptive to positive suggestion. Functional imaging studies have shown that hypnotic states can alter activity in brain regions involved in attention and emotional regulation. This allows us to strengthen neural pathways associated with calm and control.
By repeatedly visualising positive outcomes and rehearsing coping strategies in this relaxed state, clients begin to retrain the amygdala. The brain learns that situations previously labelled as threatening can in fact be managed safely.
Psychoeducation is also central. When people understand why their heart races or their stomach churns, the symptoms become less frightening. Reducing fear of the symptoms reduces the overall anxiety response.
Anxiety may begin as a protective mechanism, but it does not have to dominate your life. With the right understanding and the right support, your nervous system can find its balance again. Your body can stand down from constant alert, and you can move forwards with greater confidence, resilience and calm.
If you would like help addressing anxiety in all its forms, why not book a free consultation.