What is thermography?

What Is Thermography?

Thermography, also known as Digital Infrared Thermal Imaging (DITI), is a non-invasive imaging technique that measures temperature patterns on the surface of the body.

Every living cell produces heat as a byproduct of metabolic activity. Using a specialised infrared camera, thermography detects heat naturally emitted from the skin and converts it into a visual image called a thermogram. These images display temperature variations using colour gradients, allowing trained practitioners to observe patterns that may reflect underlying physiological activity — such as inflammation, changes in blood flow, or nervous system responses.

The technology has been in clinical use since 1959, when it was first applied to study arthritic joints at the Royal National Hospital for Rheumatic Diseases in Bath, England. The FDA approved thermography for adjunctive breast cancer screening in 1982. Since then, advances in camera resolution and image processing have significantly improved the precision and reliability of thermal imaging.

How Thermography Works

All objects, including the human body, emit infrared radiation as heat. Thermographic cameras detect this radiation and translate it into images that represent temperature differences across the skin.

Skin temperature is influenced by blood flow, metabolism, and nervous system activity. As a result, changes in circulation or inflammation can appear as areas of increased or decreased heat on a thermographic image. Modern medical-grade cameras can detect temperature differences as small as fractions of a degree Celsius.

During a scan, you sit or stand a short distance from the camera while a trained technician captures images from multiple angles. The procedure is:

• Contact-free — nothing touches your body
• Radiation-free — unlike X-rays or CT scans, the camera emits nothing
• Comfortable — there is no compression, injection, or discomfort involved

Images are captured in a temperature-controlled environment. You may be asked to acclimate for a period before scanning begins to ensure accurate and consistent results. The images are then sent to a board-certified clinical thermographer for interpretation, with a detailed written report typically completed within 3 to 4 weeks.

What Thermography Can Be Used For

Thermography is a physiological imaging tool — it provides information about how the body is functioning rather than its structure. It does not image internal anatomy like lumps or calcifications. Instead, it reveals patterns of metabolic and circulatory activity that may indicate developing changes.

Research has demonstrated clinical utility in the following areas:

• Breast health monitoring — A 2024 systematic review and meta-analysis of 22 studies found that breast thermography achieved pooled sensitivity of 88.5% and specificity of 71.8%. The authors noted that recent studies showed improving accuracy as camera technology and interpretation methods advance (Goñi-Arana et al., Systematic Reviews, 2024).
• Musculoskeletal pain — Infrared imaging can objectively measure temperature differences associated with soft-tissue injuries, nerve irritation, and chronic pain. A 2024 prospective study found 80% diagnostic accuracy for lumbosacral radicular pain, with 89% sensitivity (Kim et al., Journal of Orthopaedic Surgery and Research, 2024). Measurement reliability is strong, with intraclass correlation coefficients of 0.93–0.98 reported for upper trapezius muscle assessment.
• Vascular conditions — Thermography has shown particular promise for evaluating Raynaud's phenomenon. A 2021 study achieved 82% sensitivity, 86% specificity, and an area under the curve of 0.91 when distinguishing affected individuals from healthy controls using cold-stress rewarming protocols (Lindberg et al., Diagnostics, 2021).
• Inflammation — Because inflammation produces measurable heat, thermography can identify areas of increased thermal activity in joints, soft tissue, and other regions of the body.
• General wellness monitoring — A comprehensive 2023 scoping review identified clinical applications of infrared thermography across 38 different health conditions spanning 13 therapeutic areas (Kesztyüs et al., Medicina, 2023). Because thermography is safe to repeat, it is well suited to tracking patterns and changes over time rather than serving as a one-time assessment.

Why People Choose Thermography

Many individuals incorporate thermography into their health monitoring because it offers several practical advantages:

• No radiation exposure — Unlike X-ray-based imaging, thermography emits nothing. It is 100% radiation-free.
• No contact or compression — The camera reads heat from a distance. There is no physical contact, no compression, and no discomfort.
• Safe for repeated use — Because there is no radiation or invasive element, thermography can be repeated as often as needed for ongoing monitoring.
• Proactive tracking over time — Thermography is particularly valuable as a baseline and monitoring tool. Tracking changes in your own thermal patterns across regular scans can reveal trends that a single-point-in-time test cannot.
• Whole-body insight — Multiple body regions can be assessed in a single session.
• Complementary information — Thermography provides functional data — blood flow, metabolic activity, inflammation — that structural imaging methods do not capture. Used alongside other approaches, it contributes a more complete picture.
• Suitable for all ages and body types — Because it involves no radiation or compression, it can be used regardless of age, breast density, implants, or other factors that may affect other imaging methods.

These features make thermography appealing for individuals interested in a preventative and proactive approach to health monitoring.

How Thermography Fits Into Your Health Care

Thermography works best as part of a broader, proactive approach to health. It does not replace your doctor, your regular screenings, or any established method of care. What it offers is an additional layer of information — a way to observe how your body is functioning at a physiological level and to track that function over time.

Many clients use thermography to:

• Establish a personal thermal baseline
• Monitor specific areas of concern between medical appointments
• Gain visual, objective data to discuss with their healthcare providers
• Support early awareness and more informed decision-making

When used appropriately and alongside standard medical care, thermography can be a useful tool for awareness, tracking, and informed health decisions.

Important Limitations

It is important to understand what thermography does not do:

• It is not a diagnostic test. Thermography does not diagnose cancer, disease, or any specific condition. It identifies physiological patterns that may warrant further investigation by your healthcare provider.
• It is not a replacement for mammography. The FDA has cleared thermography devices only for adjunctive use — meaning alongside, not instead of, primary screening methods.
• It measures surface temperature only. It cannot detect internal structures such as lumps, calcifications, or tumours. What it measures is surface heat, which reflects underlying metabolic and circulatory activity.
• Specificity varies. While sensitivity is generally high, the pooled specificity of 71.8% for breast applications means some false positives can occur. This is why thermographic findings should always be evaluated alongside other clinical information.

For these reasons, thermography is best used as part of a broader healthcare approach, not as a replacement for conventional medical care.

References

1. Goñi-Arana, A., Pérez-Martín, J., & Díez, F.J. (2024). Breast thermography: a systematic review and meta-analysis. Systematic Reviews, 13, 295. https://doi.org/10.1186/s13643-024-02708-9
2. Kesztyüs, D. et al. (2023). Use of Infrared Thermography in Medical Diagnosis, Screening, and Disease Monitoring: A Scoping Review. Medicina, 59(12), 2139. https://doi.org/10.3390/medicina59122139
3. Kim, Y.C. et al. (2024). The diagnostic accuracy of infrared thermography in lumbosacral radicular pain: a prospective study. Journal of Orthopaedic Surgery and Research, 19, 427. https://doi.org/10.1186/s13018-024-04910-w
4. Lindberg, L. et al. (2021). Characteristic Features of Infrared Thermographic Imaging in Primary Raynaud's Phenomenon. Diagnostics, 11(3), 558. https://doi.org/10.3390/diagnostics11030558
5. Ring, E.F.J. (2004). The historical development of thermal imaging in medicine. Rheumatology, 43(6), 800–802. https://doi.org/10.1093/rheumatology/keg009
6. U.S. Food and Drug Administration. Breast Cancer Screening: Thermogram No Substitute for Mammogram. https://www.fda.gov/consumers/consumer-updates/breast-cancer-screening-thermogram-no-substitute-mammogram
7. American College of Clinical Thermology. Thermology FAQs. https://thermologyonline.org/faqs/Thermography, or Digital Infrared Thermal Imaging (DITI), is a safe and non-invasive way to monitor your health.