What Is Hyperthermia Therapy?
Hyperthermia therapy is a medical treatment in which body tissue is exposed to controlled, elevated temperatures — typically between 38.5°C and 42.5°C (101.3°F-108.5°F) — to produce therapeutic effects. Unlike fever, which occurs as an uncontrolled response to illness, medical hyperthermia is a precisely regulated intervention that uses the body’s own heat-response mechanisms to fight disease, stimulate the immune system, and enhance the effectiveness of other treatments.
At St. George Hospital (Klinik St. Georg) in Bad Aibling, Germany, hyperthermia has been a cornerstone of our clinical practice for more than 35 years. Our founder, Prof. Dr. Friedrich Douwes, was among the first physicians in Europe to integrate medical hyperthermia into integrative treatment protocols for cancer and chronic disease. Today, under the clinical leadership of Dr. Julian Douwes, Chief Medical Officer, our hospital operates one of the most experienced hyperthermia programs in Europe, treating patients from over 90 countries.
The Science Behind Hyperthermia
The therapeutic effects of elevated temperature are well-documented and multifaceted:
Direct Cellular Effects
At temperatures above 40°C, several important biological changes occur:
- Protein denaturation: Heat disrupts the protein structures that cancer cells and pathogens depend on for survival and replication
- DNA repair inhibition: Cancer cells, which already have compromised DNA repair mechanisms, are disproportionately damaged by heat compared to healthy cells
- Cell membrane destabilization: Elevated temperatures alter cell membrane fluidity, affecting signaling pathways and making cells more vulnerable to immune attack
- Heat shock protein (HSP) induction: Hyperthermia triggers the production of heat shock proteins, which serve as “danger signals” that alert the immune system to the presence of abnormal cells
Immune System Activation
One of the most significant effects of hyperthermia is its profound impact on immune function:
- Increased natural killer (NK) cell activity
- Enhanced dendritic cell maturation and antigen presentation
- Increased T-cell trafficking to tumors and infected tissues
- Cytokine release that promotes immune surveillance
- Improved blood flow to tissues, bringing more immune cells to target areas
Research published in the International Journal of Hyperthermia has documented the immunological mechanisms of hyperthermia extensively.
Enhanced Blood Flow and Oxygenation
Elevated temperature causes vasodilation, dramatically increasing blood flow to heated tissues. This is particularly important in cancer treatment, where tumors often have poor vascularity and hypoxic (low-oxygen) regions. By increasing blood flow and oxygenation, hyperthermia can:
- Improve delivery of chemotherapeutic agents to tumor tissue
- Enhance radiation sensitivity (oxygen is required for radiation to produce maximum DNA damage)
- Create conditions hostile to anaerobic pathogens
Types of Hyperthermia Treatment
At St. George Hospital, we employ several forms of hyperthermia, selected based on the patient’s diagnosis and treatment goals:
Whole-Body Hyperthermia (WBH)
The patient’s entire body is heated to fever-range temperatures (38.5°C-40.5°C for moderate WBH, or 41°C-42°C for extreme WBH) using infrared radiation systems. The patient lies on a treatment bed within a specialized device that raises core body temperature in a controlled, gradual manner.
Applications:
- Metastatic cancer — systemic immune activation
- Chronic Lyme disease — Borrelia spirochetes are heat-sensitive
- Chronic infections — immune stimulation and direct pathogen damage
- Autoimmune conditions — immune modulation
- Chronic fatigue syndrome — immune reset
Duration: A complete WBH session typically lasts 4-6 hours including the heating phase, plateau at target temperature, and controlled cooling.
Locoregional Hyperthermia
Heat is applied to a specific region of the body — typically the area containing a tumor — using electromagnetic energy (radiofrequency or microwave). This allows higher temperatures to be achieved in the target area while keeping systemic temperature normal.
Applications:
- Solid tumors — breast, prostate, liver, pancreatic, cervical, head and neck cancers
- Pre-operative tumor sensitization
- Combined with chemotherapy or radiation for enhanced efficacy
Local Hyperthermia
Focused heating of a small, defined area — typically a superficial tumor or localized infection site. Achieved through external applicators, intracavitary probes, or interstitial techniques.
Prostate-Specific Hyperthermia (Transurethral)
A specialized application where controlled heat is delivered directly to the prostate gland, used in the treatment of prostate conditions including prostate cancer and chronic prostatitis.
Conditions Treated with Hyperthermia
Cancer (Integrative Oncology)
Hyperthermia is one of the most evidence-based complementary oncology treatments available. The European Society for Hyperthermic Oncology (ESHO) and the International Journal of Hyperthermia have published extensive guidelines and evidence supporting its use.
In our oncology program, hyperthermia is used to:
- Enhance the effectiveness of chemotherapy (thermo-chemotherapy) — certain drugs become 2-5 times more effective at elevated temperatures
- Improve radiation sensitivity (thermo-radiotherapy)
- Stimulate anti-tumor immune responses
- Target chemotherapy-resistant tumor cells that are often heat-sensitive
- Improve quality of life during cancer treatment
Lyme Disease and Tick-Borne Infections
Borrelia burgdorferi is thermolabile — it cannot survive prolonged exposure to temperatures above 41°C. Whole-body hyperthermia exploits this vulnerability, using the patient’s own elevated body temperature to damage and kill spirochetes throughout the body, including those hidden in biofilms and intracellular compartments that antibiotics struggle to reach.
At St. George Hospital, hyperthermia is the cornerstone of our Lyme treatment protocol, combined with therapeutic apheresis to manage the Herxheimer reaction and targeted antimicrobials to address co-infections.
Post-COVID Syndrome
For patients with persistent post-COVID symptoms, moderate whole-body hyperthermia can stimulate immune rebalancing, enhance circulation (addressing the microclot pathology that researcher Dr. Beate Jaeger has highlighted), and support cellular repair mechanisms.
Chronic Fatigue and Immune Dysfunction
Whole-body hyperthermia can act as an “immune reset” for patients with chronic fatigue syndrome (ME/CFS), stimulating immune function and breaking the cycle of immune dysregulation that perpetuates symptoms.
What to Expect During Hyperthermia Treatment
Before Treatment
- Comprehensive medical evaluation and fitness assessment
- Baseline blood work and vital signs
- Hydration protocols initiated (adequate hydration is essential)
- Discussion of the treatment plan, expected sensations, and monitoring protocols
During Whole-Body Hyperthermia
- Preparation: The patient is positioned on the treatment bed. IV access is established for hydration and, if indicated, concurrent medications
- Heating phase (60-90 minutes): Core temperature is gradually raised using infrared radiation. The rate of heating is carefully controlled
- Plateau phase (60-120 minutes): Target temperature is maintained. The patient is continuously monitored by a physician and nursing team — heart rate, blood pressure, oxygen saturation, and core temperature are tracked in real time
- Cooling phase (30-60 minutes): Temperature is gradually returned to normal
- Recovery: The patient rests under observation. Hydration continues. Most patients feel tired but describe a sense of deep relaxation
After Treatment
- Rest and hydration for the remainder of the day
- Some patients experience a Herxheimer reaction (in infection treatment) or temporary fatigue
- Follow-up blood work as indicated
- Subsequent treatments (apheresis, ozone, infusions) are typically scheduled for the following day
Safety and Side Effects
Medical hyperthermia, when performed in an experienced clinical setting with proper monitoring, has a strong safety record. St. George Hospital has conducted thousands of hyperthermia treatments over more than three decades.
Common side effects (temporary):
- Fatigue on the day of treatment
- Mild headache
- Temporary increase in heart rate during treatment
- Sweating (expected and managed with hydration)
- Herxheimer reaction in patients being treated for infections
Rare complications:
- Burns (extremely rare with modern equipment and experienced operators)
- Cardiovascular stress (prevented through careful patient selection and monitoring)
- Electrolyte imbalance (managed with IV supplementation)
Contraindications:
- Severe cardiovascular disease or recent myocardial infarction
- Pregnancy
- Severe anemia
- Active bleeding or coagulation disorders
- Brain metastases (for whole-body hyperthermia)
Evidence for Hyperthermia
Hyperthermia is not an experimental therapy. It has been studied in more than 30 randomized controlled trials and is endorsed by clinical guidelines in several countries:
- The German S3 guideline for cervical cancer recommends hyperthermia in combination with radiochemotherapy
- The Dutch health insurance system covers hyperthermia for specific cancer indications
- The European Society for Hyperthermic Oncology publishes quality assurance guidelines for clinical practice
- Hundreds of peer-reviewed studies document improved outcomes when hyperthermia is added to conventional cancer treatment
Frequently Asked Questions
Is hyperthermia therapy painful?
No. Whole-body hyperthermia is not painful. Patients typically describe a sensation of deep warmth, similar to a sauna or hot bath but more evenly distributed. Mild discomfort from the sustained heat is possible but is managed by the clinical team. Locoregional hyperthermia may produce a sensation of warmth or mild heat in the treated area, which is monitored and adjusted throughout the session.
How many hyperthermia sessions do I need?
The number of sessions depends on the condition being treated. For cancer patients, a series of 6-10 sessions combined with chemotherapy or radiation is typical. For Lyme disease, 1-3 whole-body hyperthermia sessions are generally included within a 2-3 week intensive inpatient protocol. Your physician will design a treatment plan specific to your diagnosis.
Can hyperthermia be used alongside chemotherapy?
Yes — this is one of its most important applications. Hyperthermia enhances the cytotoxic effects of many chemotherapy agents, allowing for improved efficacy and, in some cases, reduced drug doses. The combination (thermo-chemotherapy) is well-studied and recommended in several European clinical guidelines.
Is hyperthermia therapy available only in Germany?
While Germany is a global leader in clinical hyperthermia, the treatment is increasingly available in other countries including the Netherlands, Italy, Japan, South Korea, and select centers in the United States. However, the level of clinical experience varies significantly between centers. St. George Hospital’s 35+ year track record and thousands of treated patients represent one of the deepest clinical experiences globally.
Experience Hyperthermia at St. George Hospital
Whether you are seeking hyperthermia treatment for cancer, Lyme disease, or another condition, the medical team at St. George Hospital offers decades of clinical expertise in one of Europe’s most comprehensive hyperthermia programs.
Contact us to learn more:
- Phone: +49 (0)8061 398-0
- Email: info@clinicum-stgeorg.de
- Visit: Contact page
St. George Hospital (Klinik St. Georg) — Rosenheimer Str. 6-8, 83043 Bad Aibling, Germany