How stress affects your body
Stress can affect sleep, appetite, digestion, concentration and how your body feels. A brief response to a difficult situation is normal, but ongoing pressure can become hard to manage. Daily routines and support from other people can help. You do not need to wait until things become severe before speaking to a healthcare professional.
What happens during a stress response?
Stress is the body's reaction to a demand. The demand can be a deadline, a crowded MRT platform, an argument at home or an unexpected bill. The reaction is much the same whatever the cause.
If the brain reads a situation as a threat, it signals the adrenal glands. They release adrenaline and, a little later, cortisol. Adrenaline raises the heart rate and blood pressure and sends more blood to the muscles. Cortisol releases stored sugar into the blood so there is fuel to act on. Breathing quickens. Digestion slows, because the body does not need it in the moment.
Many people call this the fight-or-flight response. It is useful: it lets you step back from a bus that appears without warning. Once the moment passes, the body should settle. Heart rate comes down, cortisol falls, and appetite and digestion return.
In many cases, brief stress settles once the immediate situation passes. The response varies, and severe events can have lasting effects. Ongoing stress or difficulty recovering deserves attention, above all when it affects sleep, relationships or daily activities.
How ongoing stress can affect you
Work demands, caregiving, financial strain and family difficulties can continue for weeks or months. You may find it difficult to get enough rest or practical support. You will not always be able to resolve stress through your own habits alone.
Ongoing stress can affect several aspects of daily life:
- Sleep. Stress can make it harder to fall asleep or stay asleep, and poor sleep can make coping harder the next day. A particular waking time does not reveal your cortisol level or identify the cause.
- Appetite. Stress affects people differently: some eat less, while others snack more or seek comforting foods. Changes in weight have several causes, so do not assume cortisol is behind them.
- Blood pressure. Each stressful moment pushes blood pressure up for a while. If that happens many times a day, alongside less sleep, more salt and less movement, the average goes up over time. Stress alone is rarely the whole story behind hypertension, but it adds to it.
- Gut. Digestion slows or speeds up with no clear pattern. Bloating, loose stools, constipation and heartburn are all common complaints during a stressful stretch.
- Body and mood. Tight shoulders, headaches, jaw clenching, a short temper, and feeling flat about things that used to be enjoyable are all typical.
None of these is a diagnosis on its own. They are signals that the response has been running for longer than it should.
Daily practices that may help
The aim is to give the body regular chances to recover, because ongoing stress leaves little time for it. The practices below work best in combination.
- Slow the breath. A slower breath out tells the nervous system that the threat has passed. Breathe in for about four counts and out for about six, for two or three minutes. You can do it at a desk, in a lift, or in the queue at the polyclinic pharmacy.
- Walk or move in a way you enjoy. Physical activity can help mood and sleep and provide a break from a stressful setting. Brisk walking also contributes to weekly aerobic activity; even a gentle walk can be a useful pause.
- Keep a routine. A fixed wake time, meals at about the same hours, and a cut-off for work messages give the body clock something to hold on to. The routine matters more on the hard days than on the easy ones.
- Talk to someone you trust. Describing what is difficult can help you identify support or practical changes. If family or friends are unavailable, a healthcare professional or support service can provide a starting point.
- Watch the kopi and the alcohol. Caffeine after mid-afternoon sits in the system into the night. Alcohol brings sleep on faster but breaks it up later. Both are easy to lean on in a stressful stretch, and both make the sleep problem worse.
You will get more from doing one or two of them most days than from doing all of them once.
Recognising stress in family members
Stress does not look the same in everyone.
Older adults may show stress as poor sleep, a smaller appetite, more aches, or forgetfulness, and may not use the word "stress" at all. A parent who has stopped going down to the void deck or the kopitiam may be withdrawing rather than resting.
Many teenagers under exam pressure show it as irritability, late nights on the phone, or stomach aches on school mornings. The usual advice about sleep and outdoor time matters more for them.
Adults who carry a household, a job and an ageing parent at once tend to look after everyone except themselves. If you are in this group, the practices above only work when you treat them as appointments rather than as luxuries.
At any age, a change that lasts more than a few weeks is worth noticing. That is the point at which self-management may not be enough on its own.
When and where to seek support
There is a line between a rough patch and something that needs support. These are some signs that someone has crossed that line.
- Sleep has been poor for more than a few weeks and is affecting work or home.
- There has been a noticeable change in appetite or weight without trying.
- Low mood or worry is present most days, and things that used to be enjoyable are not.
- Chest tightness, palpitations or breathlessness keep happening with no obvious physical cause.
- Alcohol, gambling or other habits have increased as a way of coping.
- There are thoughts of not wanting to be around.
A GP or polyclinic can assess persistent symptoms and discuss appropriate support. New or severe chest pain, difficulty breathing, collapse or stroke symptoms need emergency care; call 995 rather than assuming they are stress. You can reach the national mindline service for confidential 24-hour mental-health support by calling 1771 or through its webchat.
If you are thinking about suicide or self-harm, contact someone now: Samaritans of Singapore is available 24 hours on 1767, and national mindline on 1771. If you may act on these thoughts or cannot stay safe, call 995 or go to an emergency department. Stay with someone you trust if possible.
Choosing a manageable next step
Stress has physical and emotional effects, and help can include both daily habits and changes to the pressures you face. Try manageable steps, ask for practical support and seek professional care when symptoms affect your life. There is no need to wait a month before asking.
Food and lifestyle support recovery. They are not a substitute for treatment. Anyone already on medication for blood pressure, sleep or mood should keep taking it and raise any changes with the doctor who prescribed it. Anyone whose symptoms have lasted more than a few weeks should book a polyclinic appointment, and anyone in crisis should call a helpline the same day.
A practical next step
Try one practical step today, such as a short walk, a break from work messages or a conversation with someone you trust. For round-the-clock support, call national mindline 1771. If you are in immediate danger, call 995.
Sources and further reading
These references explain the guidance and research discussed above. For advice about your own health, speak to a qualified healthcare professional.
Read next
Cooking oils: which to use, and for what
The amount in the wok matters more than the name on the bottle
Myopia in Singapore: why outdoor time matters for children
Daylight