Tracking Herxheimer Reactions Without Losing Your Mind

It's day four of a new antibiotic. Your knees feel like they're full of broken glass, your brain has logged off, you slept maybe two hours, and a small voice in your head keeps asking the same question on a loop: is this still working, or am I actually getting worse?

If you've already read about what a Herxheimer reaction is, you know the answer is probably "still working." Knowing that does not make 3 AM any easier. What helps at 3 AM is having a record. Something you can look at and say, okay, last time this happened it lasted six days, peaked on day five, and then I came out the other side. This guide is about how to keep that record without turning your life into a spreadsheet.

Why a daily symptom log isn't enough

Most Lyme patients already track something. A notes app, a paper journal, a row in a daily check-in. That's good. It's also not quite enough when a Herx hits.

Here's the problem. Your baseline symptoms move around on their own. Joint pain at 3, fatigue at 3, brain fog at 4, a headache that comes and goes. When a Herx hits on top of that, everything jumps. If you only have one channel of data, the Herx blurs into your normal noise. You look back two months later and you can't tell which days were Herx days, which days were a bad weather flare, and which days were just a bad week.

You need a separate channel. One that captures:

• The day the Herx started
• What changed in your treatment around that time
• How bad it got at peak
• How many days it lasted
• Which specific symptoms flared, and how that compares to your normal baseline
• What you tried and whether anything helped

That's it. Six things. You don't need a research-grade chart. You need enough so future-you can look at this Herx, the next one, and the one after that and start to see the shape of them.

What to actually log

Here's a sane minimum. Skip anything that doesn't apply to you.

Start with the day things shifted and what was new in your treatment. "Started doxy 200mg." "Doubled the cat's claw dose." "Added clarithromycin." Even "switched generic brands" counts. Half the value of the entry is the trigger, because that's what tells you whether the same thing has happened to you before.

Then peak severity, on a 1 to 5 scale. Not how it felt the first day. How bad the worst day got. One number. If you're already using LymeTrack's 1 to 5 scale, use that. If you're on paper, the same scale works.

Duration is just how many days from "things shifted" to "back to baseline." Don't try to be precise about hours. Days is enough.

Which symptoms flared matters as much as how bad it got. Not all of them. The ones that got loud. Knees, brain fog, sweats, headache, mood. The pattern of which symptoms flare often matters more than the total severity. Some patients herx mostly in their joints. Some herx mostly in their head. Yours will have a signature.

A short note on how it compared to baseline is what makes the entry usable later. "Knee pain was a 4, normally a 2." "Brain fog way worse than a normal bad day." This is the part that prevents future-you from gaslighting present-you.

Finally, what you tried and whether it helped. Rest, extra water, electrolytes, an Epsom bath, a binder, a dose adjustment your doctor approved, an extra rest day. Mark whatever you did and a one-word verdict: helped, neutral, no. According to LymeDisease.org, the usual management toolkit includes hydration, electrolytes, gentle movement, binders, and short anti-inflammatory courses, and which of those actually moves the needle varies a lot person to person.

That's the entry. Five minutes when you're feeling okay enough to type. Three minutes when you're not. Skip days. Catch up on the back end if you have to. Imperfect logs are still useful.

The pattern that shows up over months

Here's what makes this worth doing. After two or three Herxes, you start to see something that no single bad week can show you.

Some triggers always cause a hard reaction in you. Some don't. Some used to and stopped. A patient might find that doxy gives them a brutal three-day Herx that always passes by day five, while a different antimicrobial gives them a low-grade two-week slog that never quite peaks but never quite stops. Those are very different patterns and they call for different responses. Without a record, they look the same in the moment: "I feel terrible."

A few patterns the data tends to surface:

A Herx that's getting shorter Herx after Herx. Often a good sign. Some patients describe a clear shrinking trend over months as the bacterial load drops.

A Herx that's getting longer or hitting harder than the last one with the same treatment. Worth flagging to your doctor. This is the kind of thing that's nearly impossible to argue without a record, because memory smooths everything into "I felt bad."

A roughly monthly cycle. Some patients see Herx-like crashes about every four weeks, which some clinicians link to the Borrelia life cycle. Daniel Cameron, MD writes about how variable Herx timing can be and why patient-tracked data is often what catches a pattern a single appointment can't.

A trigger you adapted to. Three weeks in, the same dose stops causing a reaction. Useful information for your LLMD, and a small win you'd otherwise forget happened.

A trigger you didn't adapt to. Six weeks in, every dose increase still hammers you. Also useful information. Sometimes it changes a treatment plan.

The point of tracking isn't to predict every Herx. It's to give you and your doctor a real conversation to have at your next appointment instead of a vague "things have been rough."

How LymeTrack handles it

LymeTrack keeps Herx logs on their own track, separate from your normal day-to-day data. The app has a 5-step daily check-in (CheckIn1Screen through CheckIn5Screen) for your regular symptom, sleep, mood, and factor logging. Herxes go somewhere else: a dedicated Herxheimer reaction screen (CheckInHerxScreen) you open when something has clearly shifted off baseline.

That separation is the whole point. Your daily check-in keeps showing your normal baseline trend. Your Herx log captures the spikes. They don't average together and turn into mush.

On the Herx screen you log peak severity on the same 1 to 5 scale, duration, the specific symptoms that flared, and the treatment you were on when it started. Later, in Compass / Insights (InsightsScreen, HealthDayDetailScreen), the app pulls those Herx entries together with your treatment timeline and your daily data so you can actually see which treatments correlate with which Herx patterns. You can see whether the second round of a med was milder than the first. You can see which symptoms tend to be your Herx signature. You can pull a clean view to bring to your LLMD.

When everything is on fire, you don't have to do anything fancy. You log the Herx, you ride it out, and you let the pattern build itself across months.

Further reading

• LymeDisease.org: The dreaded Jarisch-Herxheimer reaction. LYME SCI's plain-language overview, including the typical management toolkit.
• Daniel Cameron, MD: Herxheimer Reaction Timeline. On how Herx timing varies and why tracking matters.
• Global Lyme Alliance: What Does It Mean to Herx?. A solid patient-facing primer if you want to share something with a friend or family member who doesn't get why you feel worse on treatment.

A Herx is awful. It is also data. The version of you reading your own log six months from now will be glad present-you wrote it down, even badly, even in shorthand, even on a day when the couch was too far away.