Infrared Sauna Contraindications: Who Should Skip the Sauna (and When It’s Safe to Start)

Is it actually safe for you to use an infrared sauna? You'll note we didn't ask "Is an infrared sauna safe?" These saunas are safe. But, for certain people with certain conditions, no sauna is safe. Do you know if a sauna is safe for you?

It's a question many blogs and articles either dance around or flat-out avoid. Maybe they list a warning or two, put in something about consulting your doctor, and then get on with the sales pitch. However, it's possibly the most important question to answer before you step into a sauna, much less install one in your home.

Let's actually answer it.

Infrared saunas are safe for the vast majority of healthy adults. That's true. But there are real exceptions, some ironclad, some "talk to your doctor first," and getting clear on which group you're in is paramount.

You deserve to know who should never step into a sauna, who needs medical clearance, and even what medications interact with heat in ways most people don't know about. Of course, even with all of that information, you should still know what to actually watch for during a session.

The Quick Answer

If you're a generally healthy adult without a major cardiovascular condition, you don't have an active infection, you're not pregnant, and you're not on a medication that affects heat tolerance, the good news is that you'll almost certainly be fine. Just make sure to start with short sessions, stay hydrated, listen to your body, and you'll do well.

There are some conditions that, if you have them, you're better off not using a sauna. There are others, however, that might just require a quick conversation with your doctor.

Absolute Contraindications

These are the situations where you should not use a sauna without medical clearance, and in some cases, not at all.

Pregnancy

The American College of Obstetricians and Gynecologists advises against sauna or hot tub use during pregnancy. The main concern here is your core body temperature. Raising it above 102.2°F can happen in 10 to 20 minutes of hot air or water immersion.

In the first trimester, that level of heat exposure is associated with neural tube defects and increased miscarriage risk. Additionally, first-trimester organ development is critically temperature-sensitive.

Most physicians recommend pausing sauna use throughout the entire pregnancy and resuming sauna use postpartum, but only after you're cleared at the six-week checkup. Some doctors are okay with brief, lower-temperature sessions in the second and third trimesters, but that's a conversation with your OB.

Active Fever or Acute Infection

You already have an elevated core temperature. Adding more heat doesn't help. The sauna can also accelerate dehydration, which makes fever symptoms worse. Just wait until you're symptom-free for 48 hours.

Severe, Unstable Cardiovascular Disease

This includes a recent heart attack (within the last 3 months), uncontrolled heart failure, unstable angina, severe arrhythmias, and uncontrolled high blood pressure. See, sauna use puts a real cardiovascular load on your body. In the sauna, your heart rate elevates, your blood vessels dilate, and your blood pressure shifts.

For a stable cardiac patient, that's usually fine and sometimes beneficial. For an unstable one, it can trigger an event.

The keyword here is "unstable." Controlled, stable cardiovascular conditions usually fall under the classification of "relative contraindication." If that's the case, then you just need clearance from a medical professional.

Recent Surgery

Post-operative recovery has its own timeline, and that timeline is set by your surgeon. The concerns here are any circulation effects on healing wounds, the risk of bleeding, and the risk of infection if you're using shared facilities. Ask your surgeon when you can resume sauna use before getting into a sauna. The answer will usually be somewhere between 2 and 8 weeks after your surgery, depending on the procedure.

Hemophilia and Bleeding Disorders

Heat vasodilation increases the risk of bleeding for anyone with a clotting disorder. So, as you might imagine, sauna use is generally not recommended.

Severe Organ Failure

End-stage kidney disease, end-stage liver disease, and severe lung disease can all keep you out of the sauna. Really, you don't want to use a sauna if you have anything that compromises your body's ability to manage fluid balance, temperature regulation, or oxygen exchange.

Relative Contraindications: Get Clearance From a Medical Professional Before Using a Sauna

If you have one of these conditions, that doesn't mean you're precluded from using a sauna. But, it does mean that you should clear sauna use with your doctor first and probably modify the protocol.

Controlled High or Low Blood Pressure

For most people with well-controlled hypertension, sauna use is fine. Indeed, several studies have shown regular use modestly lowers systolic blood pressure over a few weeks. That said, you want to be cautious if your blood pressure swings. You also want to be careful if you're on medications that affect your heat tolerance.

Remember: low blood pressure can be a bigger issue than high blood pressure, as sauna use lowers blood pressure further through vasodilation. That can cause you to faint when you try to stand up.

Stable Heart Conditions

Stable coronary artery disease, well-managed arrhythmia, those who have a pacemaker with manufacturer clearance, and even some cardiac rehab patients can use saunas safely. The Japanese cardiology research on Waon therapy (a form of infrared sauna) actually recommends infrared sauna use as a heart failure treatment. That said, you should still discuss sauna use with your doctor first.

Diabetes (Especially with Neuropathy)

There are two concerns with this condition. First, peripheral neuropathy reduces your ability to feel skin temperature, which makes the risk of burning higher (though it should be noted, that this risk is much lower in infrared saunas than in traditional saunas).

Secondly, sauna use can affect blood glucose levels in ways that interact with insulin or oral medications. You want to monitor carefully, hydrate aggressively, and don't go it alone in the early weeks. Again, a conversation with your doctor before using a sauna is the best course of action.

Multiple Sclerosis

Heat sensitivity is a common MS symptom. Some MS patients tolerate infrared saunas well, while many others find that even mild heat exposure temporarily worsens symptoms. The good news is that the effect is usually temporary. The first step is to talk to your neurologist. They may recommend a very short trial sauna session (10 minutes at a low temperature).

Hyperthyroidism

An overactive thyroid already runs your metabolism hot. Adding external heat on top of that can push heart rate and stress on the cardiovascular system. Before using a sauna, get clearance from your endocrinologist first.

Implanted Medical Devices

This is the one most people get wrong. Pacemakers, implantable cardioverter defibrillators (ICDs), deep brain stimulators, cochlear implants, and implanted pain pumps each have their own rules, guidance, best practices, and so forth. Contact the device manufacturer (the number's on your wallet card) and get written clearance from your treating physician. Make sure to get both before using a sauna.

In regards to using a sauna with these medical devices, the concern isn't usually the heat itself. Instead, it's the EMF environment, which is exactly why low-EMF saunas like Healthmate's are a genuine safety upgrade over off-brand units. Healthmate has built low-EMF technology into the heater design for this reason.

Medications That Don't Mix Well with Heat

Several common medications either impair your body's heat regulation or amplify the cardiovascular effects of sauna use.

Diuretics

Remember: diuretics are already pulling water out of your body. Add in sauna use and you're at a real dehydration risk. If you take a diuretic, you need to hydrate way more aggressively before, during, and after your sessions. Plus, shorter sessions are smarter, too.

Beta-Blockers

These, of course, blunt your heart rate response and heat regulation. So, if you get into a sauna on these, your heart can't ramp up the way it normally would during heat exposure. That can not only eliminate the cardiovascular benefits you would receive from sauna use, but it can also cause dizziness. Talk to your prescriber about timing your sauna sessions in regards to your medication use.

Barbiturates and Sedatives

These can impair your judgment about overheating. You might not notice you're in trouble until you're really in trouble. Sauna use with barbiturates and sedatives is generally a bad combination.

Anticholinergics

These include some antidepressants (like amitriptyline), some antihistamines, and certain Parkinson's medications. They reduce your ability to sweat, which means you can't dump heat the way you normally would. So, using a sauna while on these causes the risk of heat exhaustion to go way up.

Stimulants

That's the word for ADHD medications, decongestants, and some pre-workout supplements. When you take them, you're already elevating your heart rate. So, using a sauna while on these can push your heart rate too high.

Cannabis and Alcohol

Both impair your temperature regulation and, of course, your judgment about how you're feeling. Don't use a sauna under the influence of either. Save them for a separate evening.

Others Who May Not Benefit From Sauna Use

Children and Teens

Most manufacturers and pediatric guidance recommend that 12 years old is the minimum age for sauna use. Even then, 12-year-olds should only use a sauna with adult supervision. Kids should have shorter sessions (10–15 minutes) at lower temperatures (100–110°F). That's for many reasons, not the least of which is that kids' bodies regulate temperature less efficiently than adults. Plus, kids dehydrate faster. No one under the age of six should use a sauna, period.

Seniors

Infrared saunas are often a better fit for older adults than traditional saunas. As infrared saunas have lower air temperatures (110–130°F vs. 180–200°F) when compared to traditional saunas, that means there's less cardiovascular strain on the body.

Many seniors get real benefits from regular sauna use, such as cardiovascular health, mobility, pain management, and better sleep, among others. For seniors using a sauna, the standard precautions apply. Always get clearance from a doctor, start with shorter sessions (10 minutes or so), as well as preventative and aggressive hydration. Never use a sauna by yourself if there's any risk whatsoever of falling or fainting.

Metal Implants and Joint Replacements

For the vast majority, metal implants are not a problem in an infrared sauna. Infrared light doesn't heat metal preferentially the way an MRI does. Plus, the temperatures involved are too low to affect titanium hardware, plates, or joint replacements.

The tissue around your implant heats to roughly the same temperature as your surrounding skin during a sauna session. While this can be different from a high-temperature traditional sauna in some cases, you do not have to be concerned if you're using an infrared sauna.

What to Watch for During a Session

Even when you're cleared by a medical professional and your routine is dialed in, your body can have an off day. Know the warning signs and, most importantly, listen to them.

End the session and step out if you experience any of these:

• Dizziness or lightheadedness
• Nausea
• Your heart is racing and doesn't slow down after you sit up
• Sharp headache
• Muscle cramping
• Sudden weakness
• A general feeling of "I'm not right."

These are early signs of heat exhaustion. They resolve quickly if you respect them. You can respect them by cooling down gradually, drinking electrolyte water, and not returning to the sauna for at least 24 hours. If your symptoms don't improve in 30 minutes or worsen, go to an urgent care. They could be a sign of something worse.

When a Doctor Might Actually Recommend a Sauna

It's worth noting that the list of contraindications isn't necessarily the whole story. There are real conditions where, if you have them, your doctor may prescribe sauna use:

1. Cardiovascular rehabilitation (Japanese Waon therapy protocols)
2. Chronic pain management, such as for fibromyalgia, arthritis, and chronic low back pain
3. Mild-to-moderate hypertension
4. Autoimmune and chronic inflammatory conditions
5. Post-stroke rehabilitation (under supervision)
6. Some neurodegenerative conditions

If your doctor recommends it, listen to them. There's a growing body of research that an infrared sauna can help those conditions and many others.

How Healthmate's Low-EMF Technology Reduces One Common Safety Concern

One of the valid safety concerns about infrared saunas is EMF exposure from cheap heaters. Generic-brand infrared sauna units can emit significantly elevated EMF. That can be a real problem for people with pacemakers or implanted devices, but most users are going to want to avoid that significantly elevated EMF generally.

Healthmate's Tecoloy™ heaters are third-party tested and certified low-EMF (some models classified as ultra-low EMF). This isn't just some marketing claim they've made. Indeed, the emissivity page on the site walks through the actual numbers. If EMF safety is a concern for you, this is a meaningful differentiator compared to budget brands.

The Bottom Line

Most people can use an infrared sauna safely. The exceptions are well-documented. Even then, most of them just need a doctor's clearance and a slightly modified protocol, not abstinence.

If you're not sure if you should use a sauna, a short conversation with your doctor can give you a definitive answer. If it makes it easier, bring in the contraindications list. If you get the green light, start with short sessions, hydrate properly, and build up properly over four weeks.

Ready to start? Browse the Healthmate catalog for residential and commercial models. For the full contraindications list, see Healthmate's contraindications page. And if you have a specific medical question, call (714) 739-6600. The team can walk you through the safety conversation before making a decision.

Frequently Asked Questions

Who should not use an infrared sauna?

People who should not use an infrared sauna include pregnant women (especially if they're in the first trimester), people with active fever or acute infection, individuals with severe unstable heart conditions, anyone with hemophilia or active bleeding, and those in recent post-operative recovery. A broader list of relative contraindications, such as controlled cardiovascular disease, diabetes with neuropathy, multiple sclerosis, hyperthyroidism, and implanted devices, should get cleared by a doctor before using a sauna.

Can you use an infrared sauna while pregnant?

The American College of Obstetricians and Gynecologists advises against sauna or hot tub use during pregnancy. That's because raising core body temperature above 102.2°F is associated with increased risk of neural tube defects, especially during the first trimester. Most physicians recommend pausing sauna use throughout pregnancy and resuming postpartum after you've been cleared at your six-week checkup.

Is it safe to use an infrared sauna with high blood pressure?

For most people with controlled hypertension, yes. Several studies have shown regular infrared sauna use modestly lowers systolic blood pressure over 2 to 3 weeks. You want to be cautious, however, if you have uncontrolled or unstable blood pressure, recently had a heart attack, severe heart failure, or are on blood pressure medications that affect heat tolerance (especially beta-blockers and diuretics). Get cleared by your doctor first before using a sauna.

Can I use a sauna with a pacemaker or other medical implant?

Ask the manufacturer first. Pacemakers, ICDs, deep brain stimulators, cochlear implants, and implanted pain pumps each have device-specific guidance. Contact the implant manufacturer (the number is usually on your wallet card). You also want to get written clearance from your treating physician. The concern is less about the heat and more about how the device functions in the EMF environment. That's one more reason why low-EMF saunas like Healthmate's provide a safety upgrade over generic-brand units.

Do metal implants, like joint replacements or surgical screws, cause problems in a sauna?

For the vast majority of people, no. Infrared light doesn't heat metal preferentially the way an MRI does. Additionally, the temperatures involved are far too low to affect titanium hardware, plates, or joint replacements. The internal temperature around an implant during a sauna session is essentially the same as the surrounding tissue.

What medications interact badly with sauna use?

The main ones include: diuretics (raise dehydration risk), beta-blockers (blunt heart rate response and heat regulation), barbiturates and sedatives (impair judgment about overheating), anticholinergics like some antidepressants (reduce sweating), and stimulants (raise heart rate too much). Also, avoid combining sauna use with alcohol or cannabis, because both impair your body's temperature regulation and your judgment.

Is an infrared sauna safe for seniors?

For most healthy seniors, yes. In fact, infrared saunas are often preferred over traditional saunas for older adults because they operate at lower air temperatures (110–130°F vs. 180–200°F), thus making them more tolerable and lowering the cardiovascular strain. Make sure to get clearance from a doctor and start with shorter sessions (10 minutes at most). Hydrate aggressively beforehand and do not use a sauna alone if you have any fear that you'll fall or faint.

Should I avoid the sauna while sick?

If you have a fever, yes. You don't want to add heat to a body that's already overheated. If you have a mild cold without a fever, however, a short session may actually help. That's because heat supports circulation and immune response. However, check with your doctor first. You want to skip the sauna entirely if you have the flu, COVID, or really any active infection causing fatigue, dehydration, or breathing difficulty.

Can children use an infrared sauna?

Most manufacturers and pediatric medical guidance recommend waiting until kids are at least 12 to use a sauna. Even then, they should only use a sauna for shorter sessions (at 10 to 15 minutes or so) with adult supervision. Additionally, 12-year-olds should only use saunas at lower temperatures (100 to 110°F). This is because children's bodies regulate temperature less efficiently than adults', and they dehydrate faster, to boot. No kid under the age of six should use a sauna.

What are the warning signs that I should end a sauna session immediately?

Stop and exit the sauna if you experience dizziness or lightheadedness, nausea, a racing heart that doesn't slow down, sharp headache, muscle cramping, sudden weakness, or any sense that you're "not right." These are early signs of heat exhaustion. After you get out, cool down gradually, rehydrate with electrolytes, and don't return to the sauna for at least 24 hours.