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Dr Bonginkosi Mafuze | Specialist Psychiatrist
As a clinician working with high-achieving professionals and parents, I often hear: “I know I’m stressed… but can stress actually make me sick?” The short answer is yes. Not in a vague “mind-body” way but in measurable, biological terms.
Stress isn't just about feeling emotional pressure; it's actually a full-body physiological response that helps protect you. When you encounter a deadline, financial worries, traffic jams, or parenting challenges, your brain releases stress hormones mainly cortisol and adrenaline. In small doses, this is helpful. Your heart beats faster, your blood sugar goes up, and you're more alert and focused. The tricky part is that this response can sometimes stay active longer than it should. When stress becomes a long-term issue, cortisol stays high for a long time, which can disrupt different systems in your body and cause problems over time.
Let's start with the immune system. When you're under chronic stress, it can weaken your immune defences, making you more prone to catching colds, taking longer to recover, and experiencing lingering infections. Many professionals find they often "get sick every time they slow down” and that’s no coincidence; it’s simply their immune system being depleted.
Second, inflammation. When cortisol levels are out of balance for a long time, it can lead to low-grade inflammation. This inflammation is often associated with headaches, muscle pain, fatigue, and even increased risk for long-term heart and metabolic issues.
Third, digestion. Your gut and brain are closely linked. When your body perceives a threat and enters survival mode, digestion tends to take a back seat. This can cause bloating, reflux, symptoms like (Irritable Bowel Syndrome) IBS, or changes in your appetite.
Sleep is another major casualty. Elevated cortisol levels interfere with deep sleep, leading to fragmented sleep. Poor sleep then worsens stress resilience, creating a cycle that is difficult to break.
Blood sugar regulation is also affected. Chronic stress can increase cravings for sugar and caffeine, destabilising energy levels and further straining the nervous system.
Physically, stress often “stores” in the body via neck and shoulder tension, jaw clenching, and lower back pain. These are not minor inconveniences; they are signs of a nervous system that has not returned to baseline.
Importantly, this does not mean stress is purely harmful. Stress is adaptive and necessary. Illness develops when recovery does not match demand.
So, what protects the body?
Three foundations:
- Regulation of the nervous system (slow breathing, movement, boundaries around stimulation).
- Sleep quality, not just hours in bed, but true restorative sleep.
- Nutritional support, including adequate magnesium intake, which plays a key role in nervous system regulation, muscle relaxation, and stress resilience.
Long-term stress can take a toll on your body, but it’s something you can change. When we see stress as a biological challenge instead of a personal failing, we move from feeling guilty to finding ways to manage it. And that’s, where true healing starts.
This article is part of our Stress Guide, where we explore the causes, science, and solutions for stress disruption. Explore Stress.