How to Track Your Mood (and How Many Bad Days Are Normal)
Updated: 1 day ago
Most people who decide to track their mood start with a system that is too big. A journal with prompts, a 1 to 10 scale, tags for sleep and exercise and caffeine. It works for four days. Then one busy evening gets skipped, the next one feels like catching up, and the notebook closes.
The method that lasts is the smallest one that still produces a pattern. Here is what that looks like, and what public data says about what "normal" is once you start looking.
The method: one question, a few words
Pick a fixed time, usually evening. The question is always the same: how was today?
Answer in a few honest words. "Fine." "Flat, skipped lunch." "Good, long walk with Dana." A number is optional. The words are what matter later.
In the morning, note how you slept in the same few words.
Do nothing else for two weeks. No analysis, no charts.
After two weeks, read the entries together and look for what the low days have in common.
That fifth step is the whole point. A single entry tells you nothing you did not already know. Fourteen entries side by side will usually show something you did not: the same person, the same short night, the same skipped meal showing up on the days you rated low.
Why the words matter more than the number
In 2012, researchers in Australia published a randomized trial with 114 young people aged 14 to 24 who had mild or worse depressive symptoms. One group logged their mood, stress, and daily activities on a phone several times a day for two to four weeks; a comparison group logged only activities. The team measured emotional self-awareness, roughly the ability to notice and name what you are feeling, at the start and again six weeks later. The paper is open access in the Journal of Medical Internet Research.
We took the observed group means from the paper's results table and computed the change:
Mood-monitoring group: emotional self-awareness rose from 61.6 at pretest to 68.9 at the six-week follow-up, a gain of 7.3 points.
Activity-only group: 61.1 to 62.2, a gain of 1.1 points.
Participants in the monitoring group made an average of 3.3 entries a day and stayed with the program for an average of 17.7 days.
The authors found that the rise in self-awareness statistically mediated a drop in depressive symptoms. The trial was small, so treat this as suggestive rather than settled. But the direction matches what most people notice after a couple of weeks: naming the feeling in words, repeatedly, makes it easier to see what is driving it.
How many bad days is normal?
This is the question new trackers ask most, and it is answerable. Every year the CDC's Behavioral Risk Factor Surveillance System asks hundreds of thousands of US adults how many of the past 30 days their mental health was "not good." We pulled the 2023 results from the CDC's open data portal and used the median value across the 50 states, DC, and territories.
56.7% of adults reported zero bad mental health days in the past month.
27.7% reported between 1 and 13.
15.4% reported 14 or more, the CDC's threshold for "frequent mental distress."
Put another way, about 43 adults in 100 had at least one rough day in the past month, and about one in six had a rough day roughly every other day. If your first two weeks of tracking show two or three low entries, you are in the middle of the distribution, not at the edge of it.
The state spread is wide. The share reporting 14 or more bad days ranged from 12.9% in Hawaii to 22.0% in West Virginia. Age matters more than geography. Taking the median of the state-level values for each age group, 23.7% of adults aged 18 to 24 reported frequent mental distress, against 8.5% of adults 65 and older, close to a three-fold difference.
The method is simple enough to repeat: filter the BRFSS prevalence dataset to 2023 and the "days when mental health status not good" question, then take the median of the state values for the overall population and for each age breakout. The dataset is linked above.
What to do with your first pattern
Once you see a pattern, the move is small and specific. If three of four low days followed a short night, protect the night before your hardest day. If a particular person shows up in the low entries, that is information, not an accusation. It might point to a topic to raise with them, not to the person.
If the pattern is not small, if most days are low and it has been that way for weeks, a tracker is the wrong tool. Talk to a doctor or a therapist. If you are in crisis or thinking about harming yourself, call or text 988 to reach the 988 Suicide & Crisis Lifeline, any time.
Try it by text
Mood Textapp runs this exact method over SMS. Each evening it texts one question, each morning it asks how you slept, you reply in a few words, and after two weeks you ask what patterns it has noticed and get a summary of your mood, sleep, and the themes that keep showing up on your low days. There is no app to install and it works on any phone that can text.
Text Hi to (572) 223-3345 to begin. Your first 20 messages are free, and after that one $9.99 a month subscription covers every Textapp. Text STOP at any time to end it.
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