You're standing in your kitchen at 4 PM on a Tuesday, holding a glass of water, and out of nowhere your chest goes tight and your eyes fill up. Nothing happened. The day is fine. You weren't even thinking about anything sad. The thought you keep coming back to is: I'm not sad about my life. My brain just dropped.
If a past provider has waved that off as "depression, probably stress," and you've been quietly sure they're missing something, this guide is for you.
What's actually happening in your brain
Lyme can cause real depressive and anxious symptoms. Not the airy "stress is bad for your immune system" version. Actual neurochemistry.
When Borrelia and the inflammation it triggers reach the central nervous system, several things happen at once. Cytokines like IL-6 and TNF-alpha go up, which is the same inflammatory pattern seen in major depression. Neurotransmitter signaling gets disrupted. The autonomic nervous system loses some of its regulation, which is why anxiety and panic can show up when nothing in your life has changed. A 2025 literature review describes new-onset psychiatric symptoms in later-stage Lyme as primarily anxiety, mood disorders, and suicidality, often mimicking primary psychiatric illness. One large cohort study found a 28% higher rate of any mental health diagnosis after a Lyme diagnosis, and a 42% higher rate of affective disorders.
So when your brain "drops" without a reason, there's a reason. The reason is biological.
Here's the part nobody likes to say out loud: chronic illness also produces real, situational depression. Years of being dismissed, losing work, losing friends, watching your body do things you didn't sign up for. That produces grief and anxiety in anyone. It is not weakness, and it is not "the real diagnosis." It can sit on top of the neuroinflammatory mood symptoms without canceling them out.
Both can be true at the same time. The goal isn't to prove one and dismiss the other. The goal is to figure out which parts move with what, so you can treat each part with the right thing.
The differentials worth tracking
A "depression" label is too coarse to be useful. What you actually want to know is whether your mood is moving in lockstep with something biological, something situational, or both.
A few questions worth sitting with for a few weeks of data:
Does your mood track with a Herx? When you bump up an antibiotic dose or a herbal protocol, does the low mood arrive on day 2 or 3 with the rest of the herx symptoms, then lift when they lift? That's a strong sign the mood drop is part of the inflammatory wave, not a permanent feature of who you are.
Does it track with sleep deficits? Three nights of broken sleep can flatten anyone. If your mood numbers crater the day after a 4-hour night and recover after a real one, that's a sleep-driven loop, not standalone depression. The fix there is sleep, not an SSRI.
Does it track with specific exposures? Some patients see mood crashes a day after alcohol, certain food triggers (gluten and dairy come up a lot in patient reports), or particular supplements. Hormonal cycles matter too. Many women with Lyme report that the week before a period stacks Lyme symptoms and mood symptoms in a way that isn't just regular PMS.
Does it track with treatment changes? Starting, stopping, or rotating antibiotics often shifts mood for a few days in either direction.
Or does it move independently? If you watch for a few months and your mood doesn't seem tethered to any of the above, it just comes and goes, that's also useful information. It points more toward an independent depressive or anxiety pattern that probably needs its own care, parallel to your Lyme treatment.
The honest answer for most people is "some of all of the above, in different proportions." That's still useful. Knowing the proportions changes what you do next.
Why scoring matters
"Depressed" is too broad to be a usable signal. A 1 to 5 scale with a one-line note attached catches the difference between "low energy and a little bummed out" (a 2) and "couldn't get out of bed, didn't shower, cried in the parking lot" (a 5). Those are not the same day. They shouldn't share a label.
A few real entries from a tracker, to make this concrete:
Tuesday: Mood 2/5. Felt flat after lunch, but worked through it. Slept 7 hours. No herx. Thursday: Mood 4/5. Low and weepy from the moment I woke up. Day 3 of doxy bump. Joint pain also up. Saturday: Mood 1/5. Good day. Saw a friend. Slept 8 hours. Monday: Mood 4/5. Anxiety chest tightness most of the morning. Period due tomorrow. Slept 5 hours.
Look at that for two months and patterns emerge. The 4/5 days cluster with herx days and short-sleep days. The 1/5 days happen when sleep is good and there's no active treatment shift. That's something your LLMD and your therapist or psychiatrist can both use, and it's something you can't see from inside a single bad afternoon.
When this stops being a tracking question
There's one place tracking is the wrong tool, and it's worth being direct about it.
If you are having thoughts of suicide, planning, or self-harm, that is not a data point to log and review next week. That is a medical issue happening right now. Neuropsychiatric Lyme can and does produce suicidality, and it deserves the same urgent care as any other suicidal crisis, regardless of cause.
In the US, the 988 Suicide and Crisis Lifeline is available 24/7 by call or text. Outside the US, your country's equivalent crisis line. Or your nearest emergency room.
This matters specifically for chronic Lyme patients because you may have been dismissed by so many providers that there's an instinct to push through, prove it's just inflammation, ride it out. Please don't. Inflammation can be lethal when it's driving suicidal thoughts. Get help in the moment, then deal with the underlying disease in parallel.
How LymeTrack handles it
Mood is one of the symptoms tracked in the 5-step daily check-in. You score it on the same 1 to 5 scale as everything else, with room for a short note. If you check in more than once on a hard day, you can. Multiple check-ins per day are part of how the app is built, exactly because mood at 8 AM and mood at 8 PM are often two different worlds.
The piece that makes mood data actually useful is factor tracking. Sleep, diet, stress, activity, and weather all log alongside symptoms. Over time the Compass and Insights view correlates mood scores against everything else you've logged: treatment changes, sleep hours, herx flags, factor exposures. That's how you start to see whether your mood drops are riding on a herx wave, on three short nights of sleep, on a specific factor, or moving independently.
A few things the app deliberately doesn't try to do. It doesn't diagnose. It doesn't replace a therapist or a psychiatrist. It doesn't decide whether what you're feeling is "really" the disease or "really" something else. That distinction is often artificial anyway, and the answer is usually some of both. What it gives you is a clean record across months that you can bring to the people who do treat you, so the conversation isn't starting from scratch every visit.
If your mood pattern is severe or persistent, please work with a mental health professional alongside your Lyme treatment, not instead of it. The data from the app is meant to support that work, not substitute for it.
Further reading
A few patient-facing and peer-reviewed sources worth bookmarking:
- Project Lyme: Managing Your Mental Health. Practical, patient-written guidance on the mental health side of chronic Lyme.
- Neuropsychiatric Manifestations of Lyme Disease (PMC, 2025). The peer-reviewed literature review covering psychiatric and cognitive impacts, if you want the medical-literature version.
- ILADS: Psychiatric Lyme Disease Brochure. Written for mental health professionals, but useful for patients who want something concrete to hand a skeptical provider.
If you take one thing from this: the fact that your low mood has a biological driver doesn't make it less real, and the fact that chronic illness has worn you down doesn't make that less real either. Track both. Treat both. And if it gets dark in the way that feels dangerous, call 988 first and sort out the rest after.
LymeTrack is a tracking tool, not medical advice. Talk to your LLMD or treating physician before changing a treatment plan.