Why keep a mood log, and what to look for

When you feel low, it can seem as if every day is the same. A mood log, a quick rating once or twice a day with a short note, often shows a different picture: better and worse days, times of day, and activities that lift or drain you. Looking back each week turns those notes into small, practical changes you can try.

Why would I write down how I feel?

When you're going through a hard patch, it can feel as if every day is the same: flat, heavy, grey. If someone asks how your week was, the honest answer seems to be "bad". But memory is a poor guide to mood. A low day tends to colour how we remember the days around it, and the better moments slip away.

Two thinking traps are at work here. The mental filter picks out the hard parts and lets the rest fade. Overgeneralising stretches a bad day into a rule: "I'm always miserable."

A mood log is a simple counterweight. You rate your mood once or twice a day, add a few words about what was happening, and look back at the end of the week. Over a few weeks, most people find the picture is more mixed than it felt, and that's useful information.

How do I keep a mood log?

It's meant to be quick. If it takes more than a minute, it's probably too detailed to keep up.

Pick a time, or two. Many people choose the evening; some add a midday check. Linking it to something you already do, like brushing your teeth, helps it stick.
Rate your mood, on a simple scale. It doesn't matter which scale you use, as long as you use the same one each time.
Add a note, if you like. A few words about what you were doing, who you were with, or anything that stood out. "Walked to work in the sun." "Long meeting, felt drained."
Look back each week. This is where the log becomes useful.

The mood tracker exercise helps you record a daily rating with a short note.

What should I look for when I look back?

When you read back over a week or two, a few questions can help:

Were all the days the same? Usually they weren't. Which days were a little better, and which were harder?
Is there a pattern in the time of day? Some people feel lowest in the morning; others find the evening hardest.
What was happening on the better days? Seeing a friend, getting outside, finishing something, a good night's sleep?
What was happening on the harder days? Too much on, too little to do, certain people or places, tiredness?

You're looking for small, practical clues, not a full explanation of how you feel.

What does it look like in practice?

Here's a made-up example of a week's notes, rated from 0 (very low) to 10 (very good):

Monday: 3. "Stayed in, scrolled most of the evening."
Tuesday: 4. "Work was fine. Quick call with my sister."
Wednesday: 2. "Bad night's sleep. Skipped lunch."
Thursday: 5. "Walked to the shop. Cooked a proper dinner."
Friday: 4. "Tired, but finished the report."
Saturday: 6. "Football in the park with friends."
Sunday: 3. "Didn't leave the flat. Dreading Monday."

Looking back, the week wasn't all at 2 or 3. The better days had something in common: being outside, being with people, or doing something with a clear end. The harder days involved staying in, poor sleep and skipped meals. That suggests a few things to try next week, like a short walk on the days that would otherwise be spent indoors.

How do I link mood to what I'm doing?

If you'd like a closer look, an activity log adds detail. For a part of the day, you write what you did and rate three things: your mood, how much you achieved, and how much you enjoyed it. After a week, you can see which activities tend to lift your mood and which drain it.

That's the starting point for behavioural activation, a well-studied CBT approach for low mood, which uses what you learn to plan more of the activities that help. The activity monitoring exercise helps you keep this kind of log.

How long should I keep it going?

Two to four weeks is usually enough to start seeing patterns. After that, some people keep a daily rating going because it only takes a moment and helps them spot a dip early. Others stop and come back to it when things feel harder. Either is fine. The log is there to help you, not to become another task on the list.

What if seeing my low scores makes me feel worse?

That can happen, especially at the start. A few things help:

Remember it's information, not a grade. A low score isn't a failure; it's a clue.
Look for the variation, not just the average. Even a small difference between days tells you something.
Keep the notes short. You don't need to analyse every day, only to notice it.
Take a break if you need one. If logging feels like it's adding to your load, stop for a while and come back to it.

When should I talk to someone?

If your mood has been low most days for two weeks or more, if you've lost interest in things you used to enjoy, or if you have thoughts that you'd be better off not here, please talk to your doctor or a mental health professional. If you're in danger now, call your local emergency number.