You probably know the main risk factors when it comes to the health of your heart: smoking, a poor diet and a sedentary lifestyle with not enough exercise can all contribute to cardiovascular diseases that can lead to heart attacks or strokes. But what you may not realise is that there are now subtler modern habits that are doing just as much damage to your heart, but they’re going unnoticed because they’ve become normalised. Common features of modern life, such as chronic stress, disrupted sleep and excessive screen time, are now being linked specifically to declining cardiovascular health.
In light of World Heart Rhythm Week, here’s what to know about what’s really damaging your heart.
What stress is actually doing to your heart
When you’re under prolonged stress, your body stays in a low-level state of alert: cortisol and adrenaline keep your heart rate and blood pressure elevated, your blood vessels constrict and inflammation builds in the background. While stress from a single event is noticeable, constant stress can be detrimental, whether you’re dealing with financial worry, relationship strain or a constant connection to social media. Over time, these factors can take a significant toll on your cardiovascular system.
Research has also linked chronic psychological stress to an increased risk of heart attack, stroke and irregular heart rhythms, including atrial fibrillation. Also known as AFib, atrial fibrillation is estimated to affect one in four adults over the age of 40 at some point in their lives. The condition happens when the heart’s upper chambers beat irregularly rather than in a coordinated rhythm, disrupting blood flow and dramatically increasing the risk of stroke and heart failure.
The problem is that conditions like atrial fibrillation usually don’t come with obvious warning signs, so you may not know there’s an issue until it’s far more serious. Regular health screenings, including blood pressure checks, can help you pinpoint a problem early on. If you belong to a medical aid, you may be able to access these screenings as part of your plan. Some medical aids will even reward you for being proactive with your health in this way. Fedhealth members, for example, get access to additional funds for day-to-day medical expenses in return for doing a Health Risk Assessment at a pharmacy or GP as part of Fedhealth’s D2D+ benefit. Getting screened isn’t about looking for problems: it’s about understanding your baseline so that if something changes, you can take action early.
Sleep deprivation and your heart rhythm
Did you know that if you sleep fewer than six hours a you’re significantly more at risk of high blood pressure, heart disease and irregular heart rhythms? During deep sleep, your blood pressure naturally dips, giving your heart a chance to recover from the demands of normal daily activity. But if your sleep is regularly cut short, the recovery window is lost, leaving your cardiovascular system under stress. But the relationship between sleep and your heart rhythm runs deeper than you may realise, as both short sleep duration and poor sleep quality have been linked to a higher risk of developing AFib. Sleep apnoea — where your breathing repeatedly stops and starts as you sleep — is one of the strongest risk factors for atrial fibrillation. If you snore heavily, wake unrefreshed despite what feels like a full night’s sleep or have been told you stop breathing while asleep, it’s worth investigating this with your doctor.
Poor sleep also drives up cortisol levels, increases your appetite for sugary or processed foods, reduces motivation to exercise, and impairs your body’s ability to regulate blood glucose. It’s not just about being tired: it’s that years of inadequate sleep can have a serious effect on your heart and body.
The screen factor
We now know that prolonged screen time affects our sleep, concentration and general happiness levels, but it’s also an independent risk factor for cardiovascular disease. Hours spent sitting still while scrolling on your phone, streaming series or working on your computer mean your circulation slows down, your metabolism idles and the muscles that normally help pump blood back to your heart are largely inactive.
Being on a screen late at night adds another layer. Blue light suppresses melatonin production, delaying the onset of sleep and reducing your sleep quality. This creates a cycle in which poor sleep increases stress, and higher stress leads to more screen time as a way to unwind.
What you can do about it
Our modern lifestyle and its associated risks aren’t going away anytime soon. But that doesn’t mean you’re powerless to keep your health on track. Start with the basics: build a consistent sleep window and protect it, introduce screen-free time in the hour before bed, and find a stress outlet that actually works for you, whether that’s exercise, time outdoors or spending time with friends or family. Small, consistent changes to these three areas can have a measurable impact on your cardiovascular health in the long run.
Most importantly, when it comes to your heart, don’t wait for obvious symptoms before you take action. Get your blood pressure checked regularly so you know where you stand and can take action on any early lifestyle interventions you may need. Prevention isn’t a luxury. It’s the best route forward to a healthier heart, and a healthier you.
