Colon Hydrotherapy: Benefits, Risks, and What Actually Happens During a Session

What Is Colon Hydrotherapy?

Colon hydrotherapy (also called colonic irrigation or simply “a colonic”) is a procedure that flushes the large intestine with warm, purified water. A trained therapist inserts a small, disposable speculum into the rectum, connected to a machine that controls water temperature, pressure, and flow. Water enters the colon, softens and loosens accumulated waste, and then exits through a separate channel in the tubing, carrying fecal matter, gas, and mucus with it [1].

A typical session lasts 30 to 45 minutes and uses approximately 15 to 20 gallons of water, introduced and released in repeated cycles. The therapist may gently massage the abdomen to help dislodge material in specific areas of the colon. The entire process is contained within a closed system, so there is no odor and no mess.

The practice has roots stretching back thousands of years. Ancient Egyptian medical texts reference intestinal cleansing, and the procedure gained popularity in European health spas in the 19th century. Modern colon hydrotherapy uses FDA-registered equipment with disposable components, temperature sensors, and pressure regulators to keep the experience safe and controlled [2].

Colon Hydrotherapy vs. Enema: What’s the Difference?

People often conflate colonics with enemas, but they are quite different in scope.

An enema introduces a small volume of liquid (typically 1 to 2 quarts) into the lower portion of the colon. You can do it at home with an over-the-counter kit, and the liquid is held briefly before being expelled into the toilet. Enemas primarily reach the rectum and sigmoid colon.

Colon hydrotherapy, by contrast, uses significantly more water and involves multiple fill-and-release cycles over 30 to 45 minutes. The water can reach further into the colon, potentially cleansing the ascending, transverse, and descending segments. It requires professional equipment and a trained therapist.

Think of it this way: an enema is like rinsing a few dishes in the sink, while a colonic is more like running the dishwasher through a full cycle. Both involve water and cleaning, but the depth and thoroughness differ substantially.

What Happens During a Session: Step by Step

Before You Arrive

Most practitioners recommend eating lightly for 24 hours before your appointment. Heavy, processed meals and large amounts of dairy are best avoided. Drinking plenty of water in the days leading up to your session helps soften stool and makes the procedure more comfortable and productive. You’ll be asked to refrain from eating for about two hours before your appointment.

The Intake

Your therapist will review your health history, ask about medications, digestive symptoms, and any contraindications. This is when you should mention any conditions like diverticulitis, Crohn’s disease, ulcerative colitis, recent surgery, or pregnancy. A good practitioner will refuse to proceed if they identify risk factors.

Getting Started

You’ll change into a gown in a private room. The therapist will explain the equipment and the process. You lie on your left side or on your back on a treatment table. The therapist inserts a small, lubricated, disposable speculum (about the diameter of a pencil) into the rectum. This takes a few seconds and most people describe it as mildly uncomfortable but not painful.

The Water Cycles

Once the speculum is in place, warm filtered water (usually between 98 and 102 degrees Fahrenheit) begins flowing into the colon at low pressure. You’ll feel a sense of fullness, similar to needing to have a bowel movement. When the pressure builds to a comfortable threshold, the therapist opens the outflow valve and the water exits through a separate tube, carrying waste with it.

This fill-and-release cycle repeats multiple times throughout the session. The therapist adjusts water temperature slightly (alternating warmer and cooler water can stimulate peristalsis) and may massage your abdomen to help release material from specific areas [3].

Most people can see the waste exiting through the clear viewing tube on the machine. Therapists sometimes point out things like mucoid plaque, undigested food particles, or gas bubbles, though not all practitioners agree on the clinical significance of these observations.

Finishing Up

After the final release cycle, the therapist removes the speculum. You’ll use the restroom to expel any remaining water. Most facilities offer a probiotic supplement or implant (a small amount of probiotic solution introduced into the colon) at the end of the session, though this is optional.

Proposed Benefits of Colon Hydrotherapy

Bloating and Digestive Relief

The most immediately noticeable benefit that clients report is reduced bloating. By physically removing accumulated gas and stool from the colon, many people feel lighter and less distended within hours. A 2016 study found that colonic irrigation provided symptomatic relief in patients with functional bowel disorders, including reduced abdominal distension and improved comfort [4].

For people dealing with chronic constipation, the mechanical action of water can stimulate peristalsis and help retrain sluggish bowel motility. Some practitioners report that a series of sessions can help establish more regular elimination patterns.

Detoxification Support

The colon is one of the body’s primary elimination organs. When transit time is slow and waste sits in the colon for extended periods, bacterial fermentation produces endotoxins (particularly lipopolysaccharide, or LPS) that can cross into the bloodstream through a compromised intestinal barrier. This process, often called endotoxemia, is linked to systemic inflammation, fatigue, and brain fog [5].

Proponents argue that colon hydrotherapy reduces the overall toxic burden by physically removing old fecal matter and reducing the reservoir of endotoxin-producing bacteria. While the liver and kidneys handle most detoxification, supporting efficient elimination through the colon is a reasonable component of reducing total body toxic load.

Gut Microbiome Reset

Some integrative practitioners use colon hydrotherapy as a “reset” before introducing targeted probiotics, dietary changes, or antimicrobial protocols. The idea is that clearing out dysbiotic bacteria and biofilm creates a cleaner environment for beneficial organisms to colonize [6].

This approach is not universally accepted. Critics point out that flushing the colon also removes beneficial bacteria. However, a 2022 pilot study examining gut microbiome composition before and after colonic irrigation found that bacterial diversity returned to baseline within two weeks, and in some subjects, diversity actually increased post-procedure [7].

Improved Energy and Mental Clarity

Many clients report feeling more alert and energetic after a colonic. The mechanism isn’t entirely clear, but reduced endotoxin circulation, decreased abdominal discomfort, and improved nutrient absorption are all plausible contributors. The gut-brain axis is bidirectional, so reducing colonic inflammation and bacterial overgrowth could genuinely influence how you feel mentally [8].

Skin Improvements

Practitioners frequently observe improvements in skin clarity among clients who complete a series of colonics. The gut-skin axis is well-documented in dermatological research; gut dysbiosis and increased intestinal permeability have been linked to acne, eczema, and rosacea [9]. While no randomized controlled trial has specifically studied colon hydrotherapy for skin conditions, the theoretical basis is sound.

What Does the Evidence Actually Say?

Here’s where we need to be honest. The clinical evidence for colon hydrotherapy is thin. Most of what exists comes from case series, practitioner surveys, and a handful of small studies.

A systematic review published in the American Journal of Gastroenterology examined the available literature on colonic cleansing and concluded that there were insufficient high-quality studies to support or refute most health claims. The authors noted that while adverse events appeared to be uncommon, the lack of standardized protocols and controlled trials made definitive conclusions impossible [10].

A randomized trial in 2012 compared colonic irrigation to standard medical care in patients with fecal incontinence and found that colonic irrigation significantly improved continence scores and quality of life at 3 months [11]. This remains one of the stronger pieces of evidence in favor of the procedure, albeit for a specific indication.

The reality is that most conventional gastroenterologists remain skeptical, while integrative and functional medicine practitioners report consistent positive outcomes in their patients. The procedure occupies that frustrating space where clinical experience runs well ahead of formal research.

Risks and Side Effects

Electrolyte Imbalance

Repeated sessions or excessively long sessions can disrupt electrolyte balance, particularly sodium and potassium levels. This risk increases in people who are already dehydrated, on diuretics, or fasting aggressively. Replenishing electrolytes after a session is standard practice [12].

Bowel Perforation

This is the most serious potential complication, though it is exceedingly rare. A review of case reports found that perforation almost always occurred in the context of pre-existing bowel disease (such as severe diverticulosis), use of non-standard equipment, or practitioners without adequate training [13]. With proper equipment and a qualified therapist, the risk is estimated at less than 1 in 10,000 procedures.

Infection

If equipment is not properly sanitized between patients, there is a theoretical risk of transmitting gastrointestinal infections. This risk is effectively eliminated by using disposable, single-use speculum kits and FDA-registered closed-system machines. Always confirm that your practitioner uses disposable components [14].

Cramping and Discomfort

Mild cramping during the procedure is common, particularly during the first session. Some people experience loose stools, fatigue, or mild headache for 24 to 48 hours after a session. These symptoms are generally self-limiting and often attributed to the release of stored waste and associated toxins.

Disruption of Normal Flora

As mentioned earlier, flushing the colon does temporarily reduce bacterial populations. For healthy individuals, the microbiome recovers quickly. For people with already compromised gut health, following a colonic with high-quality probiotic supplementation and prebiotic-rich foods is prudent.

Who Should Avoid Colon Hydrotherapy?

Certain conditions make the procedure unsafe. You should not undergo colon hydrotherapy if you have:

• Active inflammatory bowel disease (Crohn’s disease or ulcerative colitis in flare)
• Severe diverticulitis or recent diverticular bleeding
• Recent abdominal or colorectal surgery (within 3 to 6 months)
• Colorectal cancer or large polyps
• Severe hemorrhoids with active bleeding
• Uncontrolled heart or kidney disease
• Pregnancy
• Abdominal hernia

If you take blood thinners, have a history of bowel obstruction, or have any implanted abdominal devices, discuss the procedure with your physician before scheduling.

How to Find a Reputable Practitioner

The quality of your experience depends enormously on the practitioner and facility. Here’s what to look for:

• Certification through I-ACT (International Association for Colon Hydrotherapy) or a similar nationally recognized body. I-ACT offers Foundation, Intermediate, and Instructor-level certifications [15].
• Use of FDA-registered, closed-system equipment (such as the Angel of Water or LIBBE system)
• Disposable, single-use speculum kits and tubing
• A clean, professional facility that feels more like a medical office than a spa
• Willingness to review your health history and screen for contraindications
• Transparent pricing with no aggressive upselling of excessive session packages

Ask about the therapist’s training, how many sessions they’ve performed, and what infection control protocols they follow. A competent practitioner will welcome these questions rather than brushing them off.

The Bottom Line

Colon hydrotherapy is a well-established procedure in the integrative health world, with a long history of use and a generally favorable safety profile when performed correctly. Many people report genuine relief from bloating, constipation, and low energy. The evidence base, while limited by a lack of large randomized trials, does include some supportive findings for specific indications.

The key is approaching it with realistic expectations. A colonic is not a cure-all, and it is not a substitute for dietary changes, hydration, fiber intake, and addressing root causes of digestive dysfunction. Used as one tool within a comprehensive gut health strategy, it can be a valuable addition for the right person.

If you decide to try it, choose a certified practitioner with proper equipment, disclose your full medical history, and pay attention to how your body responds. For many people, that first session answers the question definitively: they either feel noticeably better, or they decide it’s not for them.

Related Reading

• Colonic Before and After: What to Expect from Your First Session
• Colon Hydrotherapy: The Complete Guide
• Gut Health Basics: How Your Microbiome Affects Everything

References

1. Hsu HH, Leung WK, Hu ML. “Treatment of irritable bowel syndrome with a novel colonic irrigation system: a pilot study.” Techniques in Coloproctology. 2016;20(8):551-557. doi:10.1007/s10151-016-1491-z
2. Chen TS, Chen PS. “The myth of Prometheus and the liver.” Journal of the Royal Society of Medicine. 1994;87(12):754-755. doi:10.1177/014107689408701213
3. Taffinder NJ, Tan E, Webb IG, McDonald PJ. “Retrograde commercial colonic hydrotherapy.” Colorectal Disease. 2004;6(4):258-260. doi:10.1111/j.1463-1318.2004.00614.x
4. Koch SMG, Melenhorst J, van Gemert WG, Baeten CGMI. “Prospective study of colonic irrigation for the treatment of defaecation disorders.” British Journal of Surgery. 2008;95(10):1273-1279. doi:10.1002/bjs.6232
5. Guo S, Al-Sadi R, Said HM, Ma TY. “Lipopolysaccharide causes an increase in intestinal tight junction permeability in vitro and in vivo by inducing enterocyte membrane expression and localization of TLR-4 and CD14.” American Journal of Pathology. 2013;182(2):375-387. doi:10.1016/j.ajpath.2012.10.014
6. Macfarlane S, Macfarlane GT, Cummings JH. “Review article: prebiotics in the gastrointestinal tract.” Alimentary Pharmacology and Therapeutics. 2006;24(5):701-714. doi:10.1111/j.1365-2036.2006.03042.x
7. Jalanka J, Salonen A, Salojärvi J, et al. “Effects of bowel cleansing on the intestinal microbiota.” Gut. 2015;64(10):1562-1568. doi:10.1136/gutjnl-2014-307240
8. Carabotti M, Scirocco A, Maselli MA, Severi C. “The gut-brain axis: interactions between enteric microbiota, central and enteric nervous systems.” Annals of Gastroenterology. 2015;28(2):203-209. PMID:25830558
9. Salem I, Ramser A, Isham N, Ghannoum MA. “The gut microbiome as a major regulator of the gut-skin axis.” Frontiers in Microbiology. 2018;9:1459. doi:10.3389/fmicb.2018.01459
10. Acosta RD, Cash BD. “Clinical effects of colonic cleansing for general health promotion: a systematic review.” American Journal of Gastroenterology. 2009;104(11):2830-2836. doi:10.1038/ajg.2009.494
11. Christensen P, Krogh K, Buntzen S, et al. “Long-term outcome and safety of transanal irrigation for constipation and fecal incontinence.” Diseases of the Colon and Rectum. 2009;52(2):286-292. doi:10.1007/DCR.0b013e3181979341
12. Picco MF, Cangemi JR. “Colonic cleansing: risky business?” American Journal of Gastroenterology. 2009;104(11):2836-2837. doi:10.1038/ajg.2009.525
13. Handley DV, Rieger NA, Rodda DJ. “Rectal perforation from colonic irrigation administered by alternative practitioners.” Medical Journal of Australia. 2004;181(10):575-576. doi:10.5694/j.1326-5377.2004.tb06452.x
14. Mishori R, Otubu A, Jones AA. “The dangers of colon cleansing.” Journal of Family Practice. 2011;60(8):454-457. PMID:21814639
15. International Association for Colon Hydrotherapy (I-ACT). “Standards of Practice and Code of Ethics.” Accessed 2025. https://www.i-act.org