Breast thermography is a screening technique that uses an infrared camera to capture heat patterns on the surface of the breast. The idea behind it is that cancerous or precancerous tissue generates more heat than normal tissue, and that heat can be detected before a lump forms. While the concept has been around for decades, thermography is not approved as a replacement for mammography and is not covered by Medicare or most insurance plans.
How Thermography Works
Cancer cells burn through energy at an unusually high rate. They consume more glucose and release more metabolic byproducts than healthy cells. As a tumor grows, it eventually outstrips its blood supply and triggers the formation of new blood vessels, a process called angiogenesis. These new capillary networks, combined with the dense cellular activity of the tumor itself, create a localized hot spot in the breast tissue.
A thermography scan picks up these temperature differences using a digital infrared camera. The camera doesn’t emit any radiation or compress the breast. It simply reads the infrared energy radiating from the skin’s surface and converts it into a color-coded heat map. Areas of higher temperature show up as warmer colors (reds and oranges), while cooler areas appear in blues and greens. A trained analyst then interprets these patterns, looking for asymmetry between the two breasts or unusual clusters of heat that could suggest increased blood flow.
What the Procedure Looks Like
A typical thermography appointment takes 30 to 40 minutes. When you arrive, you’ll be asked to undress from the waist up and sit in the exam room for 5 to 15 minutes. This acclimation period lets your skin temperature stabilize to the room’s ambient conditions, which is essential for accurate readings. The room is usually kept cool for this reason.
You’ll need to remove any jewelry near the chest and neck, and your hair must be pulled up and away from your neckline and face. The technician then takes a series of infrared images from several angles. There’s no physical contact with the breast, no compression, and no pain. The entire imaging portion itself is quick, usually just a few minutes once acclimation is complete.
Preparation Before the Scan
Because thermography depends entirely on detecting subtle temperature differences, anything that alters your skin temperature can throw off the results. The preparation list is more extensive than many people expect:
- 24 hours before: No exercise (including yoga), no physical therapy, massage, electrical stimulation, chiropractic adjustments, or direct sun exposure (including tanning beds).
- 2 hours before: No smoking and no coffee or caffeinated beverages.
- Day of the scan: Do not apply any lotions, creams, or deodorant to the chest area. Lotion can alter skin temperature enough to distort the image.
You also cannot have a sunburn at the time of the appointment. If you’re sunburned, you’ll likely need to reschedule.
How Accurate Is It?
This is where thermography’s appeal starts to narrow. One study published in Translational Cancer Research found sensitivity (the ability to correctly identify cancer) around 80 to 87%, with specificity (the ability to correctly rule out cancer) in the range of 87 to 89%. That means roughly 11 to 13% of results were false positives, flagging cancer where none existed, and 13 to 19% of actual cancers were missed entirely.
Those numbers might sound reasonable in isolation, but they come with significant caveats. Thermography struggles with small tumors located deep in the breast tissue. It also performs poorly in people with larger breasts or obesity, because the additional tissue between the tumor and the skin surface dilutes the heat signal. And unlike mammography, thermography is poor at pinpointing the exact location of a suspicious area, which makes follow-up imaging harder to target.
Mammography, by contrast, has been validated across decades of large-scale clinical trials and remains the only breast cancer screening tool shown to reduce mortality from the disease. Thermography has no comparable body of evidence.
What the FDA Says
The FDA has been unusually direct on this topic. The agency classifies thermography as an adjunctive tool only, meaning it can potentially supplement mammography but should never replace it. The FDA has issued multiple safety communications warning consumers and providers that thermography is “no substitute for mammogram.”
The agency has also taken enforcement action against clinics that marketed thermography as a standalone screening tool or as superior to mammography. If a provider tells you that thermography can replace your regular mammogram, that claim contradicts the FDA’s position.
Insurance and Cost
Medicare explicitly excludes thermography from coverage. The Centers for Medicare and Medicaid Services determined that “the available evidence does not support this test as a useful aid in the diagnosis or treatment of illness or injury.” Breast thermography was excluded from Medicare coverage as far back as 1984, and that exclusion remains in effect.
Most private insurers follow Medicare’s lead on this. As a result, thermography is almost always an out-of-pocket expense. Costs typically range from $150 to $300 per session depending on the provider and region. Some clinics offer baseline scans with follow-up comparisons at a discounted rate, but none of this is reimbursable through standard health insurance.
Why Some People Choose It Anyway
Thermography has a following among people who want to avoid the radiation exposure of mammography, who find breast compression painful or intolerable, or who prefer what they see as a more “natural” approach to screening. Younger women with dense breast tissue sometimes explore thermography because mammography is less effective in dense breasts and is not routinely recommended before age 40.
These are real concerns, and they deserve real solutions. But the risk is that someone relies on thermography as their primary screening method and misses a cancer that mammography would have caught. A normal thermogram does not mean you are cancer-free. The heat patterns it detects are indirect, influenced by many factors beyond cancer, including hormonal changes, inflammation, and even room temperature variations. A tumor that is small, deep, or slow-growing may produce no detectable heat signature at all.
If you’re interested in thermography as an additional layer of information alongside regular mammograms, that’s a conversation worth having with your care team. As a replacement, the evidence simply isn’t there.