Why Lyme Disease Becomes Disseminated: Delayed Diagnosis and Hidden Risk Factors
Who is more likely to develop disseminated Lyme disease?
Can delayed diagnosis increase the risk?
Access to care may matter more than many realize.
Risk factors for Lyme disease complications—including disseminated Lyme disease—may include more than tick exposure alone. A study by Moon and colleagues found that lower socioeconomic status, delayed diagnosis, and differences in access to care may increase the risk of more advanced disease.
Disseminated Lyme disease occurs when infection spreads beyond the initial site of the tick bite and may involve the joints, nervous system, heart, or skin.
This progression is often preventable with early recognition and treatment.
What Is Disseminated Lyme Disease?
In the Geisinger health system study from Pennsylvania, one out of three Lyme disease cases were classified as disseminated.
The most common manifestation was Lyme arthritis, followed by neurologic involvement, Lyme carditis, and secondary erythema migrans.
Moon and colleagues reported that “Lyme arthritis was the most common manifestation (55%), followed by neurological manifestations (34%), carditis (6%), and secondary erythema migrans (7%).”
Start here: Lyme disease symptoms guide
Lower Socioeconomic Status and Lyme Disease Risk
Individuals with lower socioeconomic status were more likely to develop disseminated Lyme disease in the study.
Researchers classified lower socioeconomic status by Medical Assistance use. Patients who used Medical Assistance at least half the time were more likely to have disseminated disease.
This does not mean socioeconomic status causes Lyme disease. Rather, it may reflect barriers to timely diagnosis, consistent medical access, insurance coverage, and follow-up care.
Delayed Diagnosis Can Lead to Disseminated Lyme Disease
Delayed diagnosis is one of the most important risk factors for Lyme disease complications.
The authors cited several reasons patients may experience delays, including symptom misattribution, intermittent symptoms, atypical or absent erythema migrans rash, inadequate health insurance, and misdiagnosis in urgent care or emergency settings.
When early Lyme disease is missed, the infection may progress and present later with arthritis, neurologic symptoms, or cardiac involvement.
Related: Delayed Lyme disease diagnosis
Why Urgent Care and Primary Care Access Matter
The study found that individuals using urgent care or having an ongoing relationship with a primary care doctor were less likely to develop disseminated Lyme disease.
This may reflect earlier recognition, faster treatment, or better follow-up when symptoms change.
However, the authors also raised concerns about missed diagnoses in urgent or emergency settings, particularly when the rash is atypical or absent.
Common Barriers to Early Lyme Disease Diagnosis
Patients may be missed for several reasons:
- No recalled tick bite
- No classic bull’s-eye rash
- Atypical or multiple rashes
- Symptoms mistaken for viral illness, injury, or stress
- Limited access to follow-up care
- Insurance or cost barriers
Related: How do you get Lyme disease?
What Increases the Risk of Disseminated Lyme Disease?
The risk increases when Lyme disease is not diagnosed and treated early. Factors include delayed care, lack of a visible rash, misdiagnosis, and barriers to accessing medical evaluation.
Clinical Takeaway
Risk factors for Lyme disease complications include delayed diagnosis, atypical symptoms, and barriers to timely care.
Lower socioeconomic status may increase the risk of disseminated Lyme disease because patients may face delays in recognition, evaluation, treatment, or follow-up.
Reducing these delays could lower the burden of disseminated Lyme disease for both patients and health care systems.
Related Reading
- Delayed Lyme disease diagnosis
- Early Lyme disease symptoms are often missed
- Who is more likely to fail Lyme disease treatment?
Reference
Moon, K. A., Pollak, J. S., Poulsen, M. N., Heaney, C. D., Hirsch, A. G., & Schwartz, B. S. (2021). Risk factors for Lyme disease stage and manifestation using electronic health records. BMC Infectious Diseases, 21(1), 1269. https://doi.org/10.1186/s12879-021-06959-y
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
When the average cost of treatment is out of pocket and minimal around USD 10 K in the USA, and many are spending five to ten times that, its no wonder its a poor man’s disease ? We really need patient rights respected and health care policy written by patients rights advocates and true scientists not insurance companies or corrupted medical associations working with pharmaceutical companies profiting from treating symptoms in untested or poorly tested and undiagnosed poor.