The difference between depression and major depressive disorder

And why it matters that we get it right.

I have major depressive disorder. Not “I get depressed sometimes”, or “I have had a rough couple of years.” A clinical diagnosis, a condition that has a name, a set of criteria, a treatment plan and a permanent place in how I navigate my life.

I’m sharing this because the language around depression is so muddled that even people who care deeply about mental health, good, well meaning people, often don’t understand the difference between feeling depressed and having major depressive disorder. And that gap in understanding usually has real consequences for people like me. 

Depression, usually used casually, is something most people have experienced. A prolonged low, a grief that lingers, a season of life that feels grey and heavy. That experience is real and deserves to be taken so seriously, I would never minimise that. 

But major depressive disorder is a different thing. It’s not a response to circumstances. It doesn’t lit when the circumstances change. It’s a clinical condition diagnosed against a specific set of criteria, and it can occur in the absence of any obvious reason at all. That is the hardest part to explain to someone who hasn’t lived it, that I can’t give a definitive reason why I am depressed. That there is not really a hard event in my life that I should be able to put down to feeling depressed. 

Clinically, major depressive disorder (MDD) requires five or more specific symptoms present for at least two consecutive weeks, including either depressed mood, or loss of interest in things previously enjoyed. Symptoms must represent a change from previous functioning and cause significant impairment in daily life. It is not caused by substances or another medical condition, and it is not better explained by another mental disorder. 

The criteria exist because MDD is measurable, it has diagnostic thresholds and evidence-based treatments. It is not a personality type, or a character flow, or a life outlook. It’s a medical condition. In the same way that type one diabetes is a medical condition, not just someone who “doesn’t handle sugar well.” 

Growing up in regional WA, out here we don’t talk about mental health much. The stereotype and stigma tells you to push through, to just get on with it. The land doesn’t wait for you to feel better, neither do kids, nor does business. That culture shaped me, and it also meant I spent years not knowing the words for what I was experiencing. 

MDD, for me, isn’t always visible. I don’t always look like someone who struggles to get out of bed, though I can. It can look like someone running a business, getting the kids to school, making decisions, showing up, and quietly carrying something heavy that never fully puts itself down. 

One of the hardest parts of MDD is that it doesn’t need a reason. It shows up and stays on its own schedule. The days when I am flat for no identifiable reason. When the motivation that should be there, isn’t. When I’m doing everything right and still feel like I’m operating through thick fog. Those aren’t bad days, that is the condition. 

Why does the distinction matter? Because when we blur the lines between situational sadness and clinical depression, a few things happen. 

People with MDD get told to “think positively” or “get outside more” or my personal favourite “do some exercise, move your body.” In general, these things aren’t bas advice. But they aren’t treatment for a neurological condition. Telling someone with MDD to think or exercise their way out of it is like telling someone to walk off a broken leg. 

It also works the other way. When everyone uses the phrase “I’m so depressed” after a hard week, it quietly erodes the weight of a diagnosis for those of us who carry it clinically. It’s not about policing language, it’s about understanding that for some of us, it is not a metaphor. 

I’m not writing this for sympathy, I don’t need it. I’m writing this because I’ve built a life and a business while managing a clinical condition. I think that deserves to be said plainly and without apology. 

MDD is not a weakness. It’s not incompatible with capability, with leadership, with building something. It’s a condition you manage like any other, with the right support, the right treatment, and the willingness to be honest about what you’re carrying.