Reiki Healing Side Effects

Reiki healing has no side effects reported in clinical research. What some people notice afterward is mild and temporary: tiredness, thirst, emotional release, or a stretch of unusually deep sleep. These pass within a day or two, and they are not the same thing as an adverse reaction.

Those two facts get blended together constantly, which leaves people unsure whether Reiki carries any real risk. Below we separate them properly. We cover what the research reports, what people actually describe feeling, why those feelings happen, what the term healing crisis means, how long after-effects should last, and the point at which something stops being a normal response and needs a doctor's eyes on it.

What Are the Side Effects of Reiki Healing?

The side effects of Reiki healing are, according to the research record, none. No adverse effects have been reported in the controlled studies conducted on Reiki, and the National Center for Complementary and Integrative Health (NCCIH) states that Reiki has not been shown to have any harmful effects. That is an unusual safety record for any therapy.

Two separate reviews back this up. A 2024 systematic review of five studies in cancer patients reported no side effects in any of the five. A 2022 systematic review published in Frontiers in Psychology, which screened 26 randomized placebo-controlled trials and analyzed 14 in depth, likewise recorded no side effects across the trials it examined.

What people report is a different category. Tiredness, thirst, emotional release, and vivid dreams come up often in practitioner accounts and client feedback. These are experiences rather than harms, they are not what researchers mean by an adverse effect, and telling the two apart is the point of this article. Anyone considering Reiki sessions deserves that distinction stated plainly rather than blurred.

Are There Any Dangers With Reiki?

No dangers directly related to receiving Reiki have been reported. Nothing is ingested, injected, or manipulated during a session, you stay fully clothed, and some practitioners never make physical contact at all, which leaves almost no mechanism for physical harm. Cancer Research UK states there are no reports of harmful side effects.

Serious adverse events are rare across hands-on therapies generally. A safety review by Ernst in Rheumatology examined the published literature on manual therapies and found significant injuries uncommon, and Reiki sits at the gentlest end of that spectrum by a wide margin.

The risks that do exist sit outside the treatment room. One is using Reiki in place of medical care that a symptom actually needs. The other is working with someone who is untrained or who makes claims they cannot support. Both are avoidable, and we cover both further down.

For most people the honest summary is that an hour of quiet, attentive rest carries about as much physical risk as a nap. That is also why it fits so easily into stress response care for people who cannot tolerate much else.

What Temporary After-Effects Do People Report?

The temporary after-effects people report after Reiki are tiredness, thirst, emotional release, tingling, light-headedness, mild headache, and changes in sleep. These are reported experiences rather than measured outcomes, they are consistently described as mild, and practitioner accounts place resolution at around 48 hours.

Reported After-EffectHow Often ReportedTypical DurationWhat To DoTiredness or heavinessMost commonly named across practitioner accountsRest of the dayRest, sleep earlyThirstCommon enough that practitioners mention it routinelyA few hoursDrink water before leavingEmotional release or tearfulnessDescribed in most practitioner accountsDuring or shortly after the sessionAllow it, then restTingling or warmthFrequently described during the sessionMinutesNothing neededLight-headedness on standingOccasionalMinutesSit up slowly, wait before drivingMild headacheOccasionalHoursWater, rest, avoid caffeineVivid dreams or deeper sleepCommonly describedOne or two nightsNothing needed

Sources: National Center for Complementary and Integrative Health; Cancer Research UK; Canyon Ranch practitioner accounts; published Reiki practitioner literature. Frequency descriptions reflect practitioner and client reports rather than measured incidence rates, since no study has quantified these.

For scale, a 2007 cross-sectional study of 100 massage clients found 10 percent reported minor discomfort afterward, with most symptoms resolving within 36 hours. Reiki involves far less physical input than massage, so the honest expectation is milder still. Booking a Reiki session for a time when you can take the evening slowly is the simplest way to work with all of this.

Why Do These After-Effects Happen After Reiki?

These after-effects happen because your nervous system drops into a deeply rested state and then has to come back out of it. The plausible mechanism is parasympathetic activation, the branch of your nervous system that governs rest and recovery, followed by the ordinary grogginess of surfacing from deep rest. Nothing more exotic is required to explain any of it.

Tiredness fits that picture directly. So does the light-headedness some people feel on standing, which is the same thing that happens when you get up too quickly after a long nap. Emotional release fits too, since feelings held at a distance during a busy week have room to arrive once the distraction stops.

You will see a different explanation elsewhere. Many practitioner articles attribute these effects to toxins being released into the bloodstream during a session. That explanation is not supported. The NCCIH states there is no scientific evidence supporting the existence of the energy field Reiki is traditionally described as working through, and no toxin-release mechanism has been identified. The rest is real. The detox story around it is not.

Changes in sleep patterns after a session follow the same logic. An hour of profound stillness in the afternoon shifts the evening, sometimes toward deeper sleep and occasionally toward vivid dreaming.

None of this diminishes what people get out of it. The benefits of Reiki hold up in placebo-controlled research for stress, anxiety, and mood, and they hold up without needing a detox mechanism to explain them.

What Is a Reiki Healing Crisis?

A Reiki healing crisis is a term some practitioners use for a temporary worsening of symptoms after a session, described as a sign that the treatment is working. Research on the healing crisis is very limited and largely anecdotal, and no study has established that it occurs or explained a mechanism for it. You may also see it called a detox reaction or a cleansing response.

The term is frequently confused with the Jarisch-Herxheimer reaction, and the two are not the same. The Jarisch-Herxheimer reaction is a documented, short-lived worsening of symptoms that follows antibiotic treatment of certain bacterial infections. It has an identified mechanism. The healing crisis described in complementary practice does not, and borrowing the medical name lends it credibility it has not earned.

Being clear about this protects you. The healing crisis framing teaches people to read feeling worse as evidence of progress, which is exactly the interpretation that delays a doctor's visit. Even sources within complementary practice acknowledge the research is thin and caution against leaning on it.

Some people do feel emotionally tender or unusually tired for a day after a session, and that experience is real. Naming it accurately, as a temporary response to deep rest and emotional emotional wellbeing processing, serves you better than a story about toxins.

How Long Does a Reiki Healing Crisis Last?

A Reiki healing crisis, as practitioners describe it, lasts one to three days. Practitioner accounts converge on roughly 48 hours as the point by which temporary after-effects should have settled. Reported durations in the broader complementary literature cluster in the same one to three day range.

Treat 48 hours as a working boundary rather than a rule. Most people notice nothing beyond the evening of their session. A first session, or a session during a hard stretch of life, is the most likely to produce a full day of tiredness.

Here is the part that matters more than the number. Past that boundary, the useful move stops being patience and starts being evaluation. Symptoms that persist, worsen, or arrive with anything unusual attached are not evidence of deep healing. They are symptoms, and symptoms deserve a proper look.

When Should You See a Doctor After a Reiki Session?

You should see a doctor if symptoms persist beyond about 48 hours, worsen rather than settle, or include anything you would take seriously on any other day. Reiki is not a plausible cause of significant physical symptoms, so a symptom that appears after a session almost certainly has a different explanation and should be assessed on its own merits.

Contact a healthcare provider if you experience any of the following:

• Symptoms lasting more than 48 hours or getting worse instead of easing
• Fever, chills, or flu-like illness, which points toward an infection rather than a session
• Severe or unusual pain, particularly pain unlike anything you have had before
• Chest pain, breathlessness, or fainting, which always warrant urgent assessment
• Any new symptom you have not had checked, whether or not it followed a session
• Significant emotional distress that does not settle within a day or two

Nobody should ever be told that a worrying symptom is a sign the energy is working. If a practitioner responds that way, that is a reason to find a different practitioner.

Tell your doctor about any complementary therapy you use. Not because Reiki interacts with medication or treatment, but because a full picture helps them do their job, particularly for anyone managing ongoing pain alongside other care.

Who Is Reiki Not Suitable For?

Reiki is physically suitable for almost everyone, including children, older adults, pregnant people, and those with serious illness. The situations calling for caution are about context rather than about the body: an undiagnosed symptom, a decision to use Reiki instead of medical care, or a personal history that makes stillness and touch uncomfortable.

Undiagnosed symptoms come first. Anything new and unexplained needs a medical assessment before you decide how to care for it. Reiki alongside that assessment is fine. Reiki instead of it is the one genuinely risky choice available here.

Substitution is the same problem in a longer time frame. Cancer Research UK states plainly that Reiki cannot prevent, treat, or cure cancer or any other disease. Choosing it over treatment that works is where harm enters a picture that otherwise has almost none.

Comfort matters too, and it gets overlooked. People with a history of trauma, or anyone who finds being touched or lying still with their eyes closed distressing, may find a session harder than expected. That is worth raising beforehand, and a good practitioner will adjust by working with hands held above the body or by keeping the session shorter.

Is Reiki Safe During Pregnancy and for Children?

Reiki is generally considered safe during pregnancy and for children. Existing evidence indicates Reiki is safe for people of all ages and health statuses, with no indication of risk to physical or mental health in either group. Many pregnant people use it for relaxation and stress relief.

Sessions for children usually run shorter than adult sessions, since younger clients settle and unsettle faster. Nothing about the format changes otherwise.

Check with your obstetric provider before starting any new therapy while pregnant, and with your pediatrician for a child. Not because a risk has been identified, but because your care team should know what you are doing. Reiki supports pediatric and prenatal care rather than standing in for it.

How Do You Reduce the Chance of Discomfort After Reiki?

You reduce the chance of discomfort after Reiki by resting, drinking water, and skipping caffeine and alcohol for the rest of the day. Cancer Research UK advises resting and drinking plenty of water after a session while avoiding strong caffeine-based drinks such as coffee. Those three habits handle nearly everything on the after-effects list.

Rest is the most useful of the three. Coming out of deep relaxation and straight into a demanding afternoon is what turns pleasant grogginess into feeling wrung out. Leaving the evening loose costs nothing and changes the experience considerably.

Thirst afterward is common, and hydration afterward is sensible practice following any therapy that leaves you deeply relaxed. Alcohol works against the calm and tends to flatten the benefit by bedtime.

Give yourself a few minutes before driving. Sitting up slowly and waiting until you feel fully present prevents the light-headedness that occasionally follows standing too fast.

What Should You Expect the First Time You Try Reiki?

The first time you try Reiki, expect to stay fully clothed, lie on a treatment table, and spend most of the session doing nothing at all. Sessions typically run between 20 minutes and an hour, and our own sessions are 50 minutes. Knowing the shape of it beforehand removes most of the uncertainty people arrive with.

A first session usually runs like this:

1. A short conversation about your health history and what brought you in.
2. You remove shoes and any bulky outer layers, then lie down on the table. Clothes stay on.
3. Lights dim, soft music if you want it, and a blanket if the room feels cool.
4. The practitioner places their hands on or slightly above your body, moving through a series of positions and holding each for a few minutes.
5. You may feel warmth, tingling, heaviness, or nothing in particular. Any of those is normal.
6. The session ends, and you sit up slowly and take a few minutes before standing.

Feeling nothing during a first session is a common outcome and not a failure. Falling asleep is equally common. Neither tells you much about whether the session helped, which is better judged over the following few days.

People who have had massage therapy often notice how different the two feel. There is no pressure, no kneading, and no soreness afterward, because nothing is being worked on physically.

At our Bedford Hills center some members pair a session with time in the EESystem, since both are passive and leave people in a similar state. Stacking two passive therapies works better on a first visit than pairing one with anything demanding.

How Do You Choose a Reiki Practitioner?

You choose a Reiki practitioner by checking their training level, verifying any license they hold, and paying attention to what they claim. Reiki has three recognized training levels, and anyone treating you should hold at least Level 2, which is the practitioner level qualified to work with other people. Level 1 covers self-practice only, and Level 3 denotes a master or teacher.

Licensing varies by state. Most states require Reiki practitioners to hold a massage therapy or similar license, though requirements differ, and local licensing authorities can confirm whether a license is current. Practitioners who also hold a clinical credential, such as nursing or massage therapy, bring a second set of training to the room.

The clearest warning sign is a claim. Be cautious with anyone who presents Reiki as able to cure serious illness, replace medication, or make a diagnosis. Reiki is a complementary therapy, and a practitioner who says otherwise is either untrained or overselling.

Ask what to expect, how long sessions run, and how they handle it if you feel emotional. A practitioner who answers those questions clearly is telling you something useful about how they work. You can read about our practitioners before booking, and we are happy to answer questions about training and approach beforehand.

For context on how far this has traveled into conventional settings, an American Hospital Association survey found roughly 15 percent of US hospitals, more than 800 of them, offered Reiki as part of patient services. That level of adoption reflects the safety record rather than proven efficacy, and energy healing works best when you hold both of those things in mind.

Frequently Asked Questions

Can Reiki Make You Feel Worse Before You Feel Better?

Reiki can leave you feeling tired or emotionally tender for a day, which some people describe as feeling worse before feeling better. Research on this pattern is very limited and largely anecdotal. Mild tiredness for an afternoon is ordinary. Anything that persists beyond 48 hours or worsens should be assessed by a doctor rather than interpreted as part of a healing process.

Is It Normal to Feel Tired After Reiki?

It is normal to feel tired after Reiki, and tiredness is the most commonly reported after-effect. Coming out of a deeply rested state produces the same grogginess as waking from a long nap. Most people find it settles within a few hours, and it is often followed by unusually good sleep that night.

Can Reiki Cause Headaches?

Reiki does not cause headaches in any established way, and a mild headache is occasionally reported afterward. Dehydration, caffeine timing, and lying in one position for 50 minutes are all likelier explanations than the session itself. Water and rest usually resolve it. A severe or unusual headache needs medical attention.

Should You Drink Water After a Reiki Session?

You should drink water after a Reiki session, and Cancer Research UK specifically advises drinking plenty of water afterward while avoiding strong caffeine-based drinks. Thirst is common enough that most practitioners mention it before you leave the table. The benefit comes from normal hydration rather than from flushing anything out.

Can You Drive After a Reiki Session?

You can drive after a Reiki session once you feel fully alert. Some people feel briefly light-headed or dreamy on standing, which passes within a few minutes. Sit up slowly, take a few minutes, and drink some water before getting behind the wheel.

Does Distance Reiki Have Side Effects?

Distance Reiki has no reported side effects. Remote sessions were excluded from the 2022 systematic review of placebo-controlled Reiki trials, so the evidence base for distance work is considerably thinner than for hands-on sessions. Nothing physical happens during a remote session, which leaves no plausible route to a physical effect of any kind.

How Fast Does Reiki Work?

Reiki works fast in the sense that most people notice calm during or immediately after a session. Whether that calm holds is a separate question, and it varies widely. Effects from a single session commonly last hours to a day, while benefits reported in research studies came from courses of several sessions over weeks.

The Takeaway

Reiki has one of the cleanest safety records of any therapy you could try. No adverse effects appear in the controlled research, the NCCIH confirms no harmful effects have been shown, and nothing about a session gives harm a route in. What some people notice afterward is tiredness, thirst, or emotional release, and those pass within a day or two.

Keep one boundary in mind and the rest takes care of itself. Anything that lasts beyond about 48 hours, worsens, or arrives with fever or severe pain is not a healing crisis. It is a symptom, and it deserves a doctor rather than a reinterpretation. Nobody should ever be told that feeling unwell is proof the energy is working.

We would rather you arrive with questions than with assumptions, so ask us anything before you book. Our center is at 7-9 Norm Ave in Bedford Hills, NY. Dr. Michelle Adams and our team are glad to walk you through what a session involves, or to help you book a session when you feel ready.

Being straight with people about what a therapy can and cannot do is how we work at Quantum Healing & Wellness.

Disclaimer: This information is for informational and educational purposes only and is not intended to replace or substitute the advice and/or services of a physician or other health care professional. It is not our intention to prescribe or make specific health claims for any of our technologies or products. Any attempt to diagnose and treat illness should come under the direction and supervision of your health care practitioner.

‍