Every day, we navigate a world full of risk. Driving to work, crossing the street, letting a toddler eat anything, even our most ordinary routines come with real possibilities of injury or harm. If we fully acknowledged every danger around us, we’d never leave the house. Luckily, our brains have a built‑in buffer: optimism bias. Optimism bias helps us underestimate the likelihood of negative events and overestimate the chances of positive ones. We assume bad things happen to other people, while the good things are coming straight for us. It keeps us moving forward, but in healthcare, that bias can create very real challenges. In this blog, HRW Shift break down why optimism bias is so powerful, the risks it creates, and how tailored communication can help people make better health decisions. Why We’re Wired for Optimism Optimism bias exists for a simple reason: we wouldn’t function well without it. If we constantly dwelled on every possible accident, infection, or health scare, daily life would become paralysing. Optimism steps in to quiet our anxieties, helping us feel safe enough to navigate the world with confidence. It’s the reassuring voice that says, “It’ll be fine,” even when the statistics might disagree. In other words, optimism bias is an emotional survival mechanism, one that lets us focus on living rather than worrying. The Hidden Dangers of Optimism Bias in Healthcare While optimism bias is comforting, it also carries consequences—especially when it comes to healthcare. By downplaying risk, people often: -Delay seeking care -Skip preventive screenings -Ignore early warning signs -Fail to prioritise protective behaviours And sometimes, the risk doesn’t even register. If a hazard doesn’t feel personally relevant, it’s easy to overlook entirely. Paradoxically, the very bias that protects us emotionally can leave us more vulnerable physically. In Bed with the Flu? Optimism Bias May Be Why Think about flu season. Many people intend to get the flu vaccine each year, but millions don’t follow through. Why? Often, optimism bias plays a starring role: -“I won’t catch it this year.” -“I’ve never had the flu before, so I’m fine.” -“It’s probably not that serious anyway.” Somewhere deep down, we know the flu can be dangerous. But optimism bias nudges that thought aside with a reassuring, “Don’t worry, everything will be okay.” This mindset shows up everywhere in healthcare: from ignoring mole changes, to skipping dental appointments, to putting off important check-ups. When we feel invincible, we behave like we are. So What Can We Do? Using Behavioural Insight to Reduce Risk If optimism bias makes risk feel distant, the solution is to make it feel closer and more personally relevant. Here are two behavioural strategies that work: 1. Tailored, personalised messaging People respond more strongly to risk when they can see themselves in the scenario. Make risk tangible by referencing characteristics such as age, lifestyle, location, or health status: “People like you (similar age, condition, and lifestyle) are at higher risk of X.” It’s not about fear, it’s about relevance. 2. Thoughtful use of social proof Social norms guide behaviour. Highlighting positive norms can be incredibly powerful: “82% of people like you have taken preventive action.” But be careful. Poorly framed social proof can backfire: “82% of people like you didn’t take action” This unintentionally reinforces inaction as the norm. Reducing Risk Starts with Understanding Behaviour Optimism bias in healthcare isn’t a flaw—it’s part of being human. But when we recognise how it shapes decisions, we can design communications that bridge the gap between what people know they should do and what they actually do. By making risk feel personal, relatable, and socially supported, we can empower people to make more proactive, protective choices, without stripping away the optimism that keeps us going. By Rhiannon Connolly and Jeremy Koloski Apply Now!