Radiation therapy clinics ask you to remove all jewelry from the area being treated, and this is not a suggestion you can safely ignore. Metal jewelry in or near a radiation beam can alter the dose your tissues receive, corrupt the imaging scans used to plan your treatment, and irritate skin that is already under stress. The reasons are rooted in how radiation interacts with dense materials, and the stakes are higher than most people realize.
Why Metal and Radiation Beams Are a Bad Combination
When a radiation beam hits a piece of metal, it does not simply pass through the way it moves through soft tissue. Dense, high-atomic-number materials like gold, platinum, silver, and even stainless steel cause a phenomenon where extra electrons get knocked loose and scatter in all directions. On the side of the metal closest to your skin, this creates a concentrated spike of radiation dose right at the tissue surface. Research on high-density materials in clinical electron beams has shown that this dose enhancement occurs on both sides of a metallic object, driven by the increased electron fluence that depends on the beam energy and the atomic number of the metal.1PubMed. Transmission and dose perturbations with high-Z materials in clinical electron beams
What does that mean in practice? A gold necklace resting on your chest during a breast radiation treatment, or a belly button ring in the field during an abdominal treatment, acts like a tiny dose amplifier right against your skin. The radiation team has carefully calculated how much energy should reach the tumor and how much the surrounding healthy tissue should absorb. A piece of jewelry throws that calculation off in a localized area, potentially burning the skin beneath it or altering the dose to structures the team is trying to protect.
The effect is not trivial. Studies on materials placed on the skin surface during radiation have demonstrated that even relatively thin layers of dense material can increase the surface dose for photon beams by roughly 30 to 50 percent compared to bare skin.2Journal of Biomedical Physics and Engineering. Evaluation of Dosimetric Properties of Handmade Bolus for Megavoltage Electron and Photon Radiation Therapy That research was looking at bolus materials intentionally placed to modify dose, but the physics applies equally to an unintended piece of metal sitting in the beam path. When the clinic wants to increase surface dose, they use carefully designed materials of known thickness and composition. A random ring or pendant does the same thing in an uncontrolled, unpredictable way.
How Jewelry Disrupts Treatment Planning Scans
Before your first radiation session, the treatment team takes a planning CT scan to map the tumor and surrounding anatomy in detail. Software then uses that scan to calculate exactly where the radiation beams should go and how much dose each region will receive. Metal in the scan creates bright streaks and dark voids on the images, known as metal artifacts, which can make it difficult or impossible for the planning team to see what they need to see.
These artifacts do not just make the pictures look messy. They directly affect the accuracy of dose calculations. Research has confirmed that CT metal artifacts negatively affect radiation therapy planning by making it harder to outline the target volume and by reducing the accuracy of the dose calculations themselves.3PubMed. Metal artifacts in computed tomography for radiation therapy planning: dosimetric effects and impact of metal artifact reduction A separate study reinforced that metallic objects cause artifacts that introduce significant errors to both structure visualization and the dosimetric calculations within the radiotherapy planning process.4Physics and Imaging in Radiation Oncology. The impact of a metal artefact reduction algorithm on treatment planning for patients undergoing radiotherapy of the pelvis
If you wear a necklace during your planning scan, the software may miscalculate the dose in the area around it. The treatment team might have to repeat the scan after you remove it, costing time and adding an unnecessary dose of imaging radiation. Worse, if no one catches it, the treatment plan could be built on flawed data. This is why most clinics ask you to remove jewelry well before you even get to the treatment room, ideally before the planning scan itself.
Which Items You Need to Remove
The blanket instruction “remove all jewelry” can feel vague, especially when you are anxious about treatment and trying to remember a list of rules. In general, anything metallic in or near the area being treated needs to come off. But clinics often cast a wider net than strictly necessary, because it is easier and safer to have a simple rule than to evaluate each item on the spot.
Items that commonly need to be removed include:
- Necklaces and chains: These sit directly over the chest and neck, making them relevant for head-and-neck, breast, and upper body treatments.
- Earrings: Relevant for head-and-neck radiation, but many clinics ask you to remove them regardless of treatment site to avoid them being forgotten on a day the setup changes.
- Rings: Usually only an issue if your hand or arm is in the beam path, but some clinics have a universal policy.
- Body piercings: Nipple, navel, tongue, and genital piercings can fall directly in the treatment field depending on the cancer site.
- Watches and fitness trackers: These contain metal and electronics. Radiation can also damage the electronics in a smartwatch or fitness band.
- Hair clips and bobby pins: Easy to forget, but they show up on scans and can interfere with head-and-neck treatments.
- Underwire bras: The metal wire sits right across the chest wall and is a common culprit during breast radiation planning scans.
Some patients ask whether they can simply tape over a piece of jewelry or move it aside. The answer is almost always no. Tape does not block the scatter effect, and a piece of jewelry that has been shifted a centimeter may still be in the beam path, or it may shift back during the session without anyone noticing. Removing the item entirely is the only reliable approach.
Piercings That Cannot Easily Be Removed
Body piercings present a specific challenge. Some piercings, particularly those that have been in place for years, can be difficult or painful to remove, and some people worry about the hole closing if the jewelry is out for the weeks or months that radiation treatment lasts. This is a real and common concern, and it is worth raising with your radiation oncology team before treatment begins.
For piercings outside the treatment field, you are usually fine to leave them in. A toe ring is not going to affect a head-and-neck treatment. But if the piercing is inside or near the beam area, the clinical team will strongly encourage removal. In some cases, a non-metallic retainer made of acrylic or PTFE (a type of plastic) can hold the piercing open without causing the same dose perturbation or imaging artifact problems. These retainers are inexpensive and widely available, and many radiation therapists are familiar with them as a workaround.
If a piercing absolutely cannot be removed and sits in the beam path, the treatment team needs to know about it so they can account for it in planning. They may adjust beam angles or flag the area for closer skin monitoring. Hiding a piercing from your treatment team because you do not want to take it out is the worst option: it means the dose distortion is there, the artifact may corrupt the plan, and nobody is watching for the consequences.
Permanent Implants Are Handled Differently
There is an obvious distinction between a necklace you can unclasp and a titanium hip replacement that is surgically fixed inside your body. Radiation oncology teams deal with permanent implants regularly, including orthopedic hardware, dental crowns and fillings, pacemakers, ports for chemotherapy, and surgical clips from previous operations. These cannot be removed for treatment, so the team plans around them.
The physics is the same: metal implants cause backscatter and dose perturbation in surrounding tissue. Research on titanium, one of the most common implant metals, has found that cells growing on titanium plates were more sensitive to radiation than cells on non-metal surfaces, with survival curves showing a steeper drop-off, suggesting either increased dose near the surface or a change in the biological effectiveness of the radiation.5PubMed. Backscatter radiation at tissue-titanium interfaces. Biological effects from diagnostic 65 kVp x-rays In a living patient with a hip implant receiving pelvic radiation, the treatment planning team uses specialized software to minimize the impact of this effect, adjusting beam angles to avoid sending radiation directly through the metal when possible, and using artifact-reduction algorithms to clean up the planning CT.
The key difference is that permanent implants are known quantities. They show up on every scan, they stay in the same place, and the team builds the treatment plan with full knowledge of their location and composition. A piece of jewelry, by contrast, might be present during one session and absent during another, or it might shift position slightly between treatments. That unpredictability is what makes removable metal objects so problematic: the plan cannot account for something that keeps changing.
Skin Sensitivity During Treatment
Beyond the physics of dose perturbation, there is a straightforward dermatological reason to leave jewelry off during a radiation course. Radiation causes cumulative irritation to the skin in the treated area. Over several weeks of daily sessions, many patients develop some degree of redness, dryness, or peeling in the treatment zone, a condition known as radiation dermatitis. In more severe cases, the skin can blister or become raw.
Metal jewelry resting against skin that is already inflamed and fragile creates friction and traps moisture, both of which make the irritation worse. A necklace rubbing against a reddened chest, or an earring pressing on a tender earlobe during head-and-neck treatment, adds mechanical irritation on top of the radiation-induced damage. Even outside of treatment sessions, many clinics advise patients to avoid wearing tight or rough fabrics over the treated area for the same reason. Jewelry is harder on sensitive skin than soft cotton.
Some metals can also cause contact dermatitis on their own, and radiation-damaged skin may become reactive to metals it previously tolerated. Nickel, a common component of costume jewelry, is a well-known skin sensitizer. Wearing a nickel-containing earring or ring near irradiated skin could trigger an allergic reaction that complicates an already delicate healing process. If you want to wear jewelry on parts of your body far from the treatment zone, that is generally fine. Just keep metal away from skin that is being treated or is close to the treatment borders.
What About Diagnostic Imaging Versus Radiation Therapy
People sometimes conflate the jewelry rules for a routine X-ray or CT scan with those for radiation therapy, but the stakes are different. For a standard diagnostic X-ray, the main reason to remove jewelry is that it shows up on the image and can obscure the anatomy the radiologist needs to see. A necklace overlapping a chest X-ray can mimic or hide a lung nodule. The radiation dose from a diagnostic scan is low enough that the small amount of scatter from a piece of jewelry is not going to harm your skin.
Radiation therapy is a completely different situation. Treatment doses are thousands of times higher than diagnostic doses, delivered repeatedly over weeks. At those energy levels, the dose enhancement from backscatter off a metallic object becomes clinically meaningful rather than negligible. The secondary electrons produced by X-rays interacting with metal have been studied at various energies, and while at lower diagnostic energies only a small fraction of those electrons penetrate deep enough to affect the sensitive basal cell layer of the skin, at the higher energies used in therapy the interaction is more substantial.6PubMed. Radiation-attenuating surgical gloves: effects of scatter and secondary electron production So the “take off your necklace” instruction at a radiation therapy clinic is not just an imaging quality issue: it is a safety measure to prevent localized overdose to your skin and shallow tissues.
Electronics, Gemstones, and Other Non-Metal Concerns
Metal is the primary concern, but patients sometimes ask about other materials. Gemstones in a ring or necklace are generally low-density and do not cause the same degree of scatter as the metal setting that holds them. The metal prongs and band are the problem, not the stone itself. That said, the clinic is not going to evaluate your jewelry piece by piece. Removing the whole item is simpler and eliminates any ambiguity.
Electronic devices deserve special attention. A hearing aid, insulin pump, or cardiac pacemaker contains both metal components and sensitive circuitry. Radiation can damage microelectronics, potentially causing malfunction. Pacemakers and implantable defibrillators are a particular concern: radiation oncology teams follow specific protocols to monitor cardiac devices during treatment and will coordinate with your cardiologist if the treatment field is anywhere near the device. A smartwatch or fitness tracker in the beam could simply stop working, which is an expensive nuisance rather than a safety hazard, but still worth avoiding.
Patients undergoing radiation to the head or neck sometimes ask about dental work. Amalgam fillings, crowns, bridges, and implants are all metallic and all cause scatter and artifacts. Since these cannot be removed for treatment, the team plans around them, just as they do with orthopedic hardware. However, a removable dental appliance, retainer, or denture with metal clasps should be taken out before each session. The distinction always comes back to the same principle: if you can take it off, take it off. If it is permanently fixed, tell your team so they can plan accordingly.
Practical Tips for Managing Jewelry During a Treatment Course
Radiation therapy typically runs five days a week for several weeks, so you will be going through the routine of checking for metal objects many times. A few habits make this easier.
Leave your jewelry at home on treatment days. This sounds obvious, but many patients get caught out by items they wear habitually and forget about, like a wedding ring or small stud earrings. Getting into the routine of leaving these at home saves the daily hassle of removing and storing them at the clinic. If you are worried about losing a ring you have not taken off in years, ask a jeweler to help you remove it before treatment starts, and store it somewhere safe until your course is finished.
If you have piercings in the treatment area, get non-metallic retainers before your first planning scan, not on the day of. Your radiation therapist or nurse can advise on what type works best. Having the retainers in place for the planning CT means the plan is built on anatomy without metal artifacts from the start.
Communicate with your treatment team about anything metallic in or on your body that you are unsure about. A dermal anchor, a small surgical clip from a previous procedure, a forgotten belly button ring from college: the team would rather know about it and evaluate whether it matters than discover it on a scan later. Radiation therapists check for metal objects before each session, but they cannot see everything, especially small items under clothing or inside the body. Being upfront about what metal is present and where helps everyone do their job more effectively.