Hyperthermia for Chronic Lyme: The Theory, the Clinics, and the Evidence

Patients with persistent symptoms after Lyme disease occupy contested territory. The label itself is disputed — post-treatment Lyme disease syndrome in the mainstream literature, chronic Lyme in patient communities and many private clinics. The disagreement is not merely semantic; it determines what treatments are considered reasonable.

Whole-body hyperthermia raises core temperature to roughly 41.6°C under anesthesia and monitoring, typically over one to two hours. The rationale draws on in vitro work showing Borrelia burgdorferi is heat-sensitive, and on the older tradition of fever therapy in infectious disease.

From petri dish to patient

In vitro sensitivity is a weak predictor of clinical effect. Achieving bactericidal temperatures uniformly in tissue is not the same as achieving them in a culture flask, and persistent symptoms may reflect immune dysregulation or tissue damage rather than ongoing infection — in which case killing bacteria would not be the relevant target.

Published outcomes come largely from single clinics reporting their own case series, without control groups or independent follow-up. Symptom improvement is reported; how much of it reflects the intense supportive care surrounding the procedure is unknown.

Absence of good evidence is not evidence of absence. It is, however, a reason to be careful with money, risk, and hope.

What to ask a clinic

Reasonable questions: who provides anesthesia and cardiac monitoring, what the complication rate has been, what outcome measures are collected and at what interval, and whether any data has been published or externally reviewed. A clinic confident in its results will answer plainly.