Your Lyme treatment is finally making a dent. Then you start waking up at 2 AM drenched, struggling for a breath that never quite feels complete. Your LLMD asks about Babesia. You didn't know there was a second infection to worry about.
The honest explanation
A single black-legged tick can carry more than Borrelia burgdorferi. The same tick that transmits Lyme may also carry Babesia microti, Anaplasma phagocytophilum, or Bartonella henselae. It can deliver more than one pathogen in a single bite.
When that happens, you're dealing with a co-infection: two or more tick-borne infections present in the same patient at the same time. Each pathogen has its own symptom profile, its own treatment requirements, and its own timeline. They don't stay neatly in their lanes.
The Infectious Diseases Society of America noted in mid-2026 that ER visits for tick bites across most U.S. regions are at a decade high. As tick populations grow denser and range farther north, co-infections are becoming more common, not less.
Three co-infections show up most often alongside Lyme:
Babesia is a parasite that infects red blood cells, similar in some ways to malaria. It's the one most likely to cause air hunger, that distinctive sensation of not being able to get a complete breath. Fever spikes, drenching night sweats, chills, and a particular kind of crushing fatigue that many patients say feels different from their Lyme fatigue round out its profile. It does not respond to doxycycline. It requires its own antiparasitic treatment.
Anaplasma (or anaplasmosis) is a bacterial infection that targets white blood cells. Fever, severe headache, muscle aches, and drops in white cell and platelet counts are typical. Doxycycline does cover Anaplasma, which is relevant if you're already on it for Lyme. But the infection can be serious if it goes unrecognized.
Bartonella sits in more contested territory. The research community is still working out how often it co-transmits via tick bites as opposed to other vectors. What patients consistently describe: a rash that resembles stretch marks, pain that concentrates on the soles of the feet and peaks first thing in the morning, and a neurological texture of anxiety or agitation that feels out of proportion to circumstances.
What patients report
The hard part of co-infections isn't any single symptom. It's the mix.
Lyme on its own produces a recognizable, if miserable, pattern: joint pain, brain fog, fatigue, sometimes cardiac and neurological involvement, cycling in rough weekly waves. Co-infections break that pattern in ways that don't fit.
Patients with Babesia often describe something like two simultaneous illnesses. The Lyme fatigue is one thing, diffuse and constant. Babesia fatigue arrives as a sudden crash on top of it. Night sweats with Lyme tend to correlate with herx cycles or disrupted sleep. Babesia night sweats operate on their own schedule, sometimes drenching, multiple times a night, with no obvious trigger.
Patients with Anaplasma often say their early illness felt sharper and more acute than Lyme alone. High fever. Bad headaches. Something that hit fast, more like a severe flu than the slower Lyme onset. That picture tends to blur as both infections settle in, making it harder to separate what came from where.
Patients with suspected Bartonella describe something different again: emotional dysregulation that was genuinely new for them, lymph node swelling, morning foot pain that made getting up a project, and that distinctive striped rash. Many didn't connect these symptoms to a tick bite for months.
None of this is diagnostic on its own. A physician needs test results, history, and clinical judgment. But tracking these symptoms carefully over time is the difference between showing your doctor a pattern and trying to reconstruct one from memory at an appointment.
What tracking it looks like in practice
Say you've been on a standard Lyme protocol for eight weeks. Joint pain and brain fog have improved. Then you start waking up soaked through most nights, with chest pressure you describe as "can't get a full breath." It happens three or four nights a week, but not every night.
That's not the kind of pattern a single appointment surfaces. If you've logged your check-ins, the data might look like this:
Monday: Fatigue 3/5, joint pain 2/5, brain fog 2/5. Slept 6 hours. Night sweats: no. Thursday: Fatigue 4/5, joint pain 2/5, brain fog 2/5. Slept 4.5 hours. Night sweats: yes, twice. Air hunger logged in notes. Saturday: Fatigue 4/5, joint pain dropped to 1/5. Night sweats: yes. Brain fog 3/5.
Three weeks of data and the picture is obvious: the night sweats and air hunger are tracking independently from the joint pain. They're on their own rhythm, completely decoupled from the Lyme symptom arc. That's the observation your LLMD needs. Not "I think it started around week six, maybe," but dated entries showing exactly when a secondary pattern emerged.
That distinction can change the treatment plan entirely.
How LymeTrack handles it
The 5-step daily check-in covers Lyme's usual suspects well. Co-infections often show up in symptoms that aren't on any default list: air hunger, drenching night sweats, sole-of-foot pain, temperature swings.
LymeTrack lets you add custom symptom definitions. You can name exactly what you're tracking, "air hunger," "drenching night sweats," "foot pain on waking," and rate each on the same 1-to-5 scale as everything else. Those custom entries appear in the Compass and Insights view alongside built-in symptoms, so you can see whether your Babesia-adjacent symptoms are on the same arc as your Lyme symptoms or running their own independent pattern.
Multiple check-ins per day matter here too. Co-infections often spike overnight or mid-afternoon in ways a single morning check-in would miss. If night sweats are the main symptom to track, logging a brief check-in when you wake up, covering just the two or three most relevant fields, gives you a data point right when the symptom is happening rather than twelve hours later.
The doctor-shareable report collects all of it. If you're seeing a new specialist who wasn't part of your initial workup, the report shows months of logged data: the custom symptoms, the secondary patterns, the timestamps. You don't have to reconstruct a detailed timeline from memory in a fifteen-minute appointment. The data is already there, in a format a clinician can actually use.
Further reading
- Global Lyme Alliance: Babesiosis. Patient-level overview of what Babesia is, how it differs from Lyme, and what treatment looks like.
- Infectious Diseases Society of America: Rising Tick Co-Infections. What clinicians are seeing in 2026, in relatively plain language.
- Bassett Health: Tick Season Alert. Side-by-side comparison of Lyme, Anaplasmosis, and Babesiosis symptoms for patients.
LymeTrack is a tracking tool, not medical advice. Talk to your LLMD or treating physician before changing a treatment plan.