When the body speaks

When your brain senses a challenge or threat, the fight-or-flight response switches on. Your heart beats faster, breathing quickens and muscles tense.

During a strong stress response, digestion slows or even stops, so the body can put its energy into facing the threat. That is one reason a scare can leave you with a churning stomach.

The parasympathetic nervous system controls “rest and digest” functions. Cleveland Clinic describes it as the opposite of the fight-or-flight response.

Mind-body practices like meditation, mindfulness and breathing exercises can calm the stress response and boost this “rest” side of the nervous system.

The vagus nerves carry signals between your brain, heart and digestive system. The vagus nerve is the main nerve of the rest-and-digest system, and it plays a part in digestion, heart rate, immune responses and mood.

Cleveland Clinic suggests looking after it with everyday habits: staying physically active, eating well, and practising meditation, hypnotherapy or yoga.

Cortisol is a hormone made by the adrenal glands, which sit on top of the kidneys. It plays a key role in the body’s stress response, released after fast-acting hormones like adrenaline, and helps provide quick energy.

Cortisol follows a daily rhythm. For most people it peaks in the morning, just before waking, and is lower in the evening.

Cortisol that stays high for a long time can weaken the immune system and promote inflammation. Only a clinician can test and interpret hormone levels.

Acute stress is short-term stress that comes and goes quickly. Chronic stress is long-term stress that goes on for weeks or months.

Chronic stress can lead to long-term health issues affecting the immune, digestive, heart and reproductive systems, and it can raise the risk of depression and anxiety.

Headaches, body pain, dizziness and shaking are common physical signs of stress.

When we are tense, we often clench our jaw, scrunch our forehead or hold our shoulders up, which can add to head and neck pain.

Fight-or-flight makes the heart beat faster. Stress can cause a racing heartbeat or chest pain, and long-term stress can raise blood pressure and cause palpitations (feeling your heart pound or skip).

Under stress, breathing speeds up to bring in more oxygen. Fast, shallow breathing can leave you feeling lightheaded, tingly or short of breath, which can feel scary and make worry grow.

Slow breathing is one of the quickest ways to tell your body it is safe. Relaxation exercises like deep breathing are recommended for managing stress.

Your gut is very sensitive to stress. Stress can cause stomach and digestive problems, and long-term stress is linked to weight changes and conditions like irritable bowel syndrome.

This is why you might feel sick before a big event, or lose your appetite when you are worried. The next section, “The gut–brain connection”, explains more.

Muscles tense up when we are stressed, ready to act. If stress doesn’t ease, they can stay tight, leading to aches, pains and jaw clenching.

Gentle movement, stretching and muscle relaxation exercises help release this tension.

A body stuck in “alert mode” finds it hard to switch off at night. Loss of sleep and exhaustion are common signs of stress.

Poor sleep then makes stress harder to handle, so it can become a cycle. A steady sleep routine helps break it.

Long-term stress can weaken the immune system, which is why some people catch more colds during hard times. Stress has also been linked to flare-ups of conditions like psoriasis and arthritis.

Stress can also show on the skin. Stress rashes (hives) are a known example.

Harvard Health explains that stress and emotions like anxiety, sadness, fear and anger can disrupt digestion.

What can happen

• Bacteria crossing the gut lining and triggering immune responses
• More gut inflammation
• More sensitivity to pain or bloating
• Food moving through the gut faster or slower

Even milder stress, like public speaking, can slow digestion for a while and cause stomach pain.

Ongoing gut problems can heighten anxiety and stress. Johns Hopkins researchers think the gut may also help trigger emotional changes, not just respond to them.

This may help explain why people with irritable bowel syndrome and other functional bowel problems have depression and anxiety more often than others.

“Functional” means the gut is working differently, even though tests may not show damage. Irritable bowel syndrome is a well-known example.

Harvard Health reports that functional gut problems affect 35% to 70% of people at some point in life, more often women than men.

Because the two “brains” talk, therapies that help one may help the other. Cognitive behavioural therapy (CBT) helps people change unhelpful thoughts and habits and learn coping skills.

Approaches with support

• CBT
• Gut-directed hypnotherapy, which may help when symptoms happen even without obvious stress
• Meditation, mindfulness, breathing and yoga, which can ease gut symptoms and lower stress
• Relaxation training, which works well alongside CBT

Cleveland Clinic lists big life events as common sources of stress: a loved one’s illness or death, marriage, separation or divorce, moving, having a baby, starting or losing a job, and retiring.

When the stress response stays switched on for weeks, it causes wear and tear. Headaches, stomach trouble, aches and poor sleep can all flare during these seasons of life.

What helps

• Ask people for practical help, like a meal or a lift
• Drop or delay anything that can wait
• Expect a flare during big changes, so it doesn’t frighten you
• Protect the basics: sleep, regular meals, a short daily walk

Stress doesn’t only come from big events. Having a lot to finish in a short time, an argument with someone close, money worries, or a morning where everything goes wrong can all switch on the body’s alarm.

One hassle is easy to shrug off. Five in a row can leave you with a tight jaw, a churning stomach and a pounding head by evening.

What helps

• After an argument, move your body to let the stress out
• Say no, or “not this week”, when you’re overloaded
• Take two minutes of slow breathing between tasks
• Write tasks down and pick the one that matters most today

For some people, symptoms begin or flare after an infection, a migraine or a physical injury.

This doesn’t mean you imagined the illness or that you are making the symptoms up. The nervous system can get “stuck” in a pattern after a big shock to the body.

What helps

• Be patient: recovery after illness often takes longer than we hope
• Get new or changing symptoms checked by your clinical provider
• Pace yourself instead of pushing through
• Return to activity gradually as you recover

Hearing about illness can make us pay closer attention to our own bodies. Attention turns symptoms up, which can start the worry–symptom loop. Spending hours searching symptoms online often keeps the worry going.

Cleveland Clinic notes that childhood trauma and very high stress can make health worries more likely later on.

What helps

• Choose one trusted source, and limit health news
• Do something absorbing, like a walk or a call
• Notice the urge to search, and wait 30 minutes before deciding
• Talk the worry through with your clinical provider rather than the internet

Experiences like childhood neglect, abuse or other trauma are listed as risk factors for body-focused distress. A smell, a place or an anniversary can bring tension or pain back, even when you are safe now.

Not everyone with stress-related symptoms has a trauma history. If you do, it isn’t your fault, and it can be worked through.

What helps

• A trauma-informed therapist can help. See the Healing from trauma guide.
• Plan extra care around hard dates
• Tell a trusted person what tends to bring it back
• Use grounding: name five things you can see and hear right now

Relaxation exercises like deep breathing, visualisation, mindfulness, yoga, tai chi or muscle relaxation can help calm the body’s alarm system.

Practise when you feel okay, not only when symptoms flare. That way the skill is ready when you need it. See the Breathing basics guide for step-by-step exercises.

Physical activity, even a short walk, helps release stress and can boost your mood.

Do a steady amount each day rather than a lot on good days and nothing on bad days. If you have a health condition, ask your clinical provider what kind of activity is right for you.

Keeping a journal is a recommended way to cope with stress. Writing down symptoms, stress, sleep and activity can reveal patterns you didn’t notice.

Attention turns symptoms up. When you notice an urge to check your body or search online, try something absorbing instead, like a walk or a call to a friend.

This doesn’t mean ignoring real symptoms. It means not letting them take over your whole day.

Setting goals for your day, week and month can help you feel more in control. Saying no when you’re overloaded, focusing on what you got done each day, and accepting what you can’t control can help too.

A steady sleep routine, regular healthy meals and avoiding extra caffeine all help the body handle stress.

The Royal College of Psychiatrists also suggests cutting down on smoking and alcohol, and tackling other stresses in your life where you can.

Talking things through with someone you trust can ease the worry that keeps the body on alert.

You could share this guide with them, so they understand that body symptoms are real and how they can help.

Yoga and tai chi are among the relaxation practices recommended for stress. Doing them in a class adds friendly faces and a regular routine.

Community centres, libraries and faith groups often run free or low-cost classes.

Support groups can help you feel less alone and share what has helped others. Your doctor, hospital or local mental health services may know of groups near you.

Online communities can help too. Just remember that what people share is personal experience, not medical advice.