What Is Stress, And How Does It Affect Your Body?

The run-down on stress: 

• Stress is the body’s natural response to physical, emotional or psychological pressure, activating systems designed to help you cope, adapt and respond to challenges.
• Stress can affect the body in many different ways, including sleep disruption, headaches, fatigue, muscle tension, brain fog and feeling emotionally overwhelmed.
• Small daily habits like movement, sleep, mindfulness, social connection and recovery time may help support stress management and overall wellbeing over time.
• Long-term stress management isn’t about avoiding stress completely. It’s about building realistic routines and support systems that help the body recover more consistently.

Stress is something almost everyone has experienced, even if we can’t always name what we’re feeling. Sometimes it can be obvious: that overwhelmed, stretched-too-thin sensation that follows a busy week. Other times it can be subtle, like a headache that keeps coming back or that constant feeling of being ‘on’. 

Understanding stress can help you learn ways to manage it more effectively. In this guide, we’ll explore what it actually is, how it affects the body and ways to help you learn how to deal with stress.

Stress 101

At its core, stress is the body’s response to a challenge or demand¹. Whether that challenge is physical, emotional, environmental or psychological, the body reacts by activating systems designed to help us cope, adapt and respond². 

When the brain detects a stressor, the body activates a built-in stress response system designed to help you cope. This response is adaptive, meaning it’s intended to prepare the body to respond, react and recover when faced with challenges2.

In the short term, that response can actually work in your favour, helping to sharpen focus, increase alertness and prepare the body to handle difficult situations2.

However, problems can arise when stress becomes constant or starts feeling bigger than our ability to manage it³. Work pressures, financial concerns, family responsibilities, health issues, poor sleep and everyday life demands can all stack up over time. 

Of course, not all stress is necessarily negative. Some forms of stress may feel motivating, energising or exciting, such as starting a new job, training for an event or preparing for a meaningful life milestone2.

What are the symptoms of stress?

The stress response involves the brain, nervous system, hormones and immune system, which means its effects can show up physically, emotionally, cognitively and behaviourally¹.

For many people, stress symptoms build gradually. What starts as feeling a bit overwhelmed can eventually show up as disrupted sleep, tension headaches, irritability, fatigue or difficulty concentrating. 

Common stress symptoms may include:

• Headaches or muscle tension4
• Trouble sleeping or feeling restless at night5
• Fatigue or low energy5
• Difficulty concentrating or brain fog5
• Feeling anxious, overwhelmed or emotionally reactive5
• Irritability or low mood5
• Changes in appetite¹
• Digestive discomfort or changes in bowel habits¹
• Racing thoughts or constant worrying5
• Pulling away from routines or social connection¹

Keep in mind that stress symptoms are individual. Some people notice emotional changes first, while others experience more physical symptoms such as headaches, fatigue or digestive discomfort. 

What are the physical symptoms of stress? 

When the body perceives stress, it activates the “fight or flight” response. The body will increase heart rate and stress hormones to prepare the body to respond quickly to perceived challenges2. While this response can be helpful in short bursts, ongoing stress may keep the body in a heightened state of alertness for longer than intended.

Common physical symptoms of stress may include5:

• Muscle tension or tight shoulders and neck
• Headaches or migraines
• Rapid heartbeat or palpitations
• Shallow or faster breathing
• Fatigue or low energy
• Digestive discomfort or bloating
• Sleep disruption or difficulty winding down
• Feeling physically restless or “on edge”

Physical stress symptoms are the body’s way of signalling that it may need more recovery, rest or support. Small acts of wellness habits that help reduce stress may help support the body’s stress response over time.

How does stress affect everyday life?

Stress doesn’t always stay contained to one moment or one difficult day. When stress builds up over time, it can start influencing the way people think, feel, sleep, work and connect with others in everyday life1.

For some people, stress shows up as feeling constantly tired or mentally overloaded. Others may notice they become more irritable, emotionally reactive or withdrawn. Even small daily tasks can begin feeling harder to manage when the brain and body are stuck in a prolonged stress response3.

How to reduce stress 

Stress is a normal part of life, but when it starts feeling constant or overwhelming, small daily habits can play an important role in helping the mind and body recover. Here’s how to reduce daily stress.

Move your body regularly

Regular movement can help support both physical and mental wellbeing during stressful periods. This doesn’t mean intense workouts or rigid routines. Walking, stretching, strength training, yoga or any form of movement you genuinely enjoy may help release physical tension and create opportunities to mentally reset3.

Prioritise sleep and recovery

Stress and sleep are closely connected. When stress builds up, sleep often becomes more difficult, while poor sleep can make stress feel even harder to manage the next day.

Creating a more consistent sleep routine, reducing stimulation before bed and allowing time to properly wind down may help support better recovery and stress regulation over time3.

Try mindfulness or breathing practices

Mindfulness, meditation and slow breathing exercises can help create moments of calm throughout the day, particularly during periods of mental overload or overwhelm.

This doesn’t have to involve long meditation sessions. Even a few minutes of slowing your breathing, stepping away from screens or focusing on the present moment may help interrupt the cycle of stress and overthinking6.

Stay connected to people you trust

Stress often feels heavier when people try carrying it entirely on their own. Spending time with supportive friends, family, or people who help you feel grounded can provide emotional support and perspective during difficult periods6. Even small moments of connection, like a phone call, can help reduce feelings of isolation and overwhelm.

Spend time outdoors 

Time in nature or natural light can help create separation from constant stimulation and busy routines. Whether it’s sitting outside with a book, walking through a park or getting morning sunlight, outdoor time may help support relaxation, mood and sleep-wake rhythms6.

Be mindful of caffeine and alcohol

Both caffeine and alcohol can influence stress and sleep patterns, particularly when consumed in excess or later in the day. For some people, high caffeine intake may increase feelings of nervousness or restlessness, while alcohol may interfere with sleep quality and recovery overnight6.

Focus on small, realistic changes

Trying to “fix” stress all at once can sometimes become stressful in itself. Often, the most sustainable approach is focusing on small changes that feel manageable enough to repeat consistently.

How to manage stress in the long term 

Managing stress over the long term is about reducing the overall load on the mind and body, over time. Rather than reacting to stress once it’s already peaked, long-term stress management is about building the routines and habits to support resilience day to day. Here are some ways to reduce stress.

Build consistent daily routines

Regular sleep patterns, structured meals, movement and predictable routines can help create a greater sense of stability during stressful periods. Consistently getting enough rest helps support recovery, emotional regulation and overall wellbeing3. Even small habits like maintaining a regular bedtime or allowing time to properly unwind at night may help support stress management over time.

Make movement part of everyday life

Regular physical activity doesn’t just support physical health, it can also help regulate mood, energy levels and stress responses3. Long-term stress management often works best when movement becomes part of a sustainable routine rather than something done occasionally during high-stress periods. The key is choosing movement that feels realistic enough to maintain consistently.

Set boundaries where possible

Ongoing stress often builds when demands consistently outpace recovery time. While not every stressor can be controlled, setting clearer boundaries around work, social commitments, downtime, or screen time may help create more balance.

This can sometimes mean:

• Taking proper breaks throughout the day
• Saying no to unnecessary commitments
• Protecting time for rest or hobbies
• Reducing overstimulation where possible

Learn your stress triggers

Understanding what increases your stress can help you respond more proactively rather than reactively. Some people notice stress builds when they're sleep-deprived, overcommitted or skipping meals. Recognising these patterns can make it easier to prepare for difficult periods, build supportive routines and identify when extra support might be needed³. 

Stay connected and seek support when needed

One of the best ways to reduce stress is to stay connected to friends, family or support networks. This can help reduce feelings of stress, especially during difficult periods. Plus, these connections can help you recognise when stress feels beyond your ability to cope alone. 

If stress feels persistent, overwhelming or starts affecting daily life, mood or sleep regularly, speaking with a GP or qualified healthcare professional can be an important step3. Your healthcare team should be considered a key part of your available support network.

Taking stress seriously 

Stress is a normal part of being human. But ‘normal’ doesn't mean it should be ignored, especially when it starts showing up in sleep, mood, energy, concentration and everyday life in ways that feel hard to shake. 

The reassuring thing is that managing stress rarely requires one perfect solution. It comes back to small, consistent habits that give the body and mind more opportunity to recover. Prioritising sleep, moving regularly, building genuine moments of rest into busy routines, and staying connected to supportive people can all make a real difference over time. 

Looking for more ways to support yourself? Explore the Swisse Wellness Hub for more articles on the connection between stress and the immune system and a guide to self-care.

References:

1. Yaribeygi, H., Panahi, Y., Sahraei, H., Johnston, T. P., & Sahebkar, A. (2017). The impact of stress on body function: A review. EXCLI Journal, 16, 1057–1072. https://doi.org/10.17179/excli2017-480 
2. Chu B, Marwaha K, Sanvictores T, et al. Physiology, Stress Reaction. [Updated 2024 May 7]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK541120/ 
3. Better Health Channel. (2022). Stress. https://www.betterhealth.vic.gov.au/health/healthyliving/stress#stress-management 
4. Sic, A., Bogicevic, M., Brezic, N., Nemr, C., & Knezevic, N. N. (2025). Chronic Stress and Headaches: The Role of the HPA Axis and Autonomic Nervous System. Biomedicines, 13(2), 463. https://doi.org/10.3390/biomedicines13020463 
5. Attia M, Ibrahim FA, Elsady MA-E, Khorkhash MK, Rizk MA, Shah J and Amer SA (2022). Cognitive, emotional, physical, and behavioral stress-related symptoms and coping strategies among university students during the third wave of COVID-19 pandemic. Front. Psychiatry 13:933981. doi: 10.3389/fpsyt.2022.933981 
6. Better Health Channel. (2022). Stress busters. https://www.betterhealth.vic.gov.au/health/healthyliving/Stress-busters