Persistent Symptoms
If you are experiencing ongoing fatigue, pain, or cognitive difficulties after completing treatment for Lyme disease, you are not imagining it. These experiences are real, they affect a meaningful percentage of Lyme patients, and Project Lyme is committed to funding the research that will lead to better answers and better care.
What Are Persistent Symptoms?
Persistent symptoms following Lyme disease treatment can include a wide range of difficulties. The most commonly reported are profound, unrelenting fatigue not relieved by rest; musculoskeletal pain; and cognitive problems — difficulties concentrating, memory lapses, and what patients describe as "brain fog."
- Debilitating fatigue unrelieved by rest
- Widespread or migratory joint and muscle pain
- Cognitive difficulties: memory, concentration, word-finding
- Sleep disturbances
- Headaches (often described as pressure or throbbing)
- Peripheral neuropathy: numbness, tingling, or burning in extremities
- Mood changes including anxiety and depression
- Sensitivity to light and sound
What Is PTLDS?
Post-Treatment Lyme Disease Syndrome (PTLDS) is the term used by researchers and clinicians for persistent symptoms that continue or begin after completing standard antibiotic treatment. Approximately 10–20% of Lyme patients develop PTLDS. Current research is exploring immune dysregulation, possible bacterial persistence, microbiome changes, and autoimmune responses as potential mechanisms.
You Have Been Heard
If you've been told your symptoms are "all in your head" or that you should be better by now — you are not alone. Thousands of patients share this experience. Project Lyme advocates for your care and for the research that will provide real answers.
Navigating Care
Finding appropriate care for persistent symptoms can be challenging. These steps may help:
- Keep a detailed symptom journal — use our Symptom Journal tool
- Seek a clinician with experience in post-infectious syndromes and tick-borne illness
- Consider a second opinion from an infectious disease specialist
- Address mental health as part of whole-person care — see Mental Health Support
- Connect with others — see our Community Stories
The Research Landscape
Project Lyme funds research specifically focused on persistent symptoms. Studies are investigating immune dysregulation, anti-inflammatory interventions, and biomarker discovery to improve diagnosis and develop new treatments. See our Treatment Research page for current work.