Depression in Adults: Signs & When to Seek Help

Everyone feels sad, tired, or low sometimes — that's just part of life. But depression is different from a bad week. It's a heavy, lasting feeling that affects how you think, feel, and function, and it doesn't just go away with a good night's sleep or a holiday.

As a psychiatrist, I often meet people who've been struggling for months, even years, before finally reaching out — usually because they weren't sure if what they felt "counted" as depression, or they thought they just had to push through it. This article explains what depression really feels like, and when it's time to get help.

What Is Depression?

Depression (sometimes called clinical depression or Major Depressive Disorder) is a real medical condition that affects how you feel, think, and go about your day. It's not a sign of weakness, and it's not something you can just "snap out of." It involves real changes in the brain — and the good news is, it's very treatable with the right support.

Common Signs of Depression

Depression can look different from person to person, but here are the most common signs to watch for. If several of these have been happening most days for two weeks or more, it's worth taking seriously.

How It Can Make You Feel

• Feeling sad, empty, or hopeless most of the time
• Losing interest in things you used to enjoy
• Feeling irritable or easily frustrated, even over small things
• Feeling worthless, or guilty over things that aren't really your fault
• Struggling to feel motivated, even for simple tasks

Physical Signs of Depression

• Sleep problems — sleeping too much, or unable to fall or stay asleep
• Appetite or weight changes, either eating a lot more or a lot less
• Feeling tired or low on energy, even after resting
• Trouble focusing, remembering things, or making decisions
• Pulling away from friends, family, or things you used to do
• In more serious cases, thoughts of death or suicide

Is It Just Sadness, or Is It Depression?

Sadness usually has a clear reason, and it tends to fade once things get better. Depression is different — it can stick around even when nothing bad is currently happening, often doesn't have one clear cause, and lasts much longer. Some people describe it not as sadness, but as feeling numb, or like "the colour has gone out of everything."

How Doctors Check for Depression

Depression isn't diagnosed with a quick quiz or checklist — it takes a proper conversation. A thorough check-up usually includes:

• A detailed conversation about how long you've been feeling this way, how bad it is, and how it's affecting your life
• Ruling out other causes — some medical conditions (like thyroid problems) or medications can cause similar symptoms
• Checking on your safety — including any thoughts of self-harm
• Talking through treatment options together — therapy, medication, lifestyle changes, or a mix, depending on what fits you best

When Should You See a Doctor?

If low mood or loss of interest has lasted more than two weeks and is affecting your work, relationships, or daily life — it's worth talking to someone, even if you're not sure it's "bad enough." Depression is very treatable, and getting help early usually makes recovery faster and easier.