Is Float Therapy Safe? Side Effects and Precautions

Float therapy is one of the safest wellness practices available. The combination of shallow water (10-12 inches), extreme buoyancy (you cannot sink), and private, controlled environments creates an inherently low-risk experience. However, understanding the potential side effects and contraindications helps you float with confidence.

The Safety Record

Clinical Trial Safety Data

The most authoritative safety data comes from published clinical trials:

2024 RCT (75 participants): Six float sessions were "feasible, safe, and well-tolerated" with "few negative effects" in adults with anxiety and depression
2018 Feinstein study (50 participants): No participants experienced worsening anxiety, even among those with multiple anxiety disorders
2014 pilot trial: No adverse events reported during the study period
Decades of commercial operation: Millions of float sessions have been conducted worldwide with an extremely low adverse event rate

Why Floating Is Inherently Safe

Drowning risk is virtually zero: The salt concentration makes it physically impossible to sink. Even unconscious people float face-up.
No drugs or invasive procedures: Floating is entirely passive and non-pharmacological.
Self-controlled: You can exit the tank at any time, open the lid, or turn on the light.
Temperature neutral: Water at skin temperature prevents hypothermia and hyperthermia.
Professional supervision: Staff are on-site during your session, though they do not enter your private room.

Common (Minor) Side Effects

Salt Water Eye Irritation

What happens: Salt water splashes into your eyes, causing temporary stinging
How common: Experienced by approximately 20-30% of first-time floaters
Prevention: Keep hands away from face; move slowly when entering and adjusting position
Treatment: Spray bottle of fresh water is always within reach in the tank
Duration: Stinging resolves within 30-60 seconds after rinsing

Ear Discomfort

What happens: Salt water enters the ear canal, causing a plugged or uncomfortable sensation
How common: Occasional, primarily in people who do not use earplugs
Prevention: Use the silicone earplugs provided by the center
Treatment: Tilt head to drain water; rinse with clean water in the post-float shower
Note: Salt water in ears is not harmful, just uncomfortable

Skin Sensitivity

What happens: The high salt concentration can irritate sensitive skin, particularly on freshly shaved areas, cuts, scrapes, or eczema patches
How common: Variable — depends on skin condition
Prevention: Apply petroleum jelly to any cuts or sensitive areas before entering. Do not shave the day of your float.
Duration: Irritation resolves after rinsing salt off in the shower

Nausea

What happens: Mild nausea from the unusual vestibular experience, particularly during the first float
How common: Rare (estimated 2-5% of first-time floaters)
Prevention: Avoid heavy meals before floating; keep eyes closed (visual-vestibular conflict in darkness can contribute)
Treatment: Exit the tank if nausea persists. Usually resolves once you are upright.

Post-Float Dizziness

What happens: Brief lightheadedness when standing after the session
How common: Occasional, similar to standing up after a long bath
Prevention: Sit up slowly, pause before standing, use handrails
Duration: Resolves within 1-2 minutes

Uncommon Side Effects

Emotional Release

What happens: Deep relaxation can surface suppressed emotions — crying, grief, or anxiety during or after a float
How common: Uncommon but not rare. More likely in people with significant unprocessed stress or trauma.
Is it harmful?: No. Emotional release during relaxation is a recognized psychological phenomenon and is generally considered positive.
What to do: Allow the emotion to flow without judgment. Discuss with a therapist if it raises concerns.

Restlessness and Frustration

What happens: Inability to relax, feeling trapped, frustration with the experience
How common: More common in first-time floaters with high anxiety or control needs
Management: Keep the lid open, leave a small light on, use breathing techniques
Long-term: Usually resolves with practice (by session 2-3)

Skin Dryness

What happens: The salt can have a drying effect on skin and hair
Prevention: Shower thoroughly after floating; use moisturizer and conditioner
Duration: Temporary, resolves with standard skin care

Contraindications: Who Should Not Float

Absolute Contraindications

Open wounds, cuts, or surgical incisions: The high salt concentration will cause significant pain and may interfere with healing
Active skin infections: Risk of contaminating the water and worsening infection
Uncontrolled epilepsy: Seizure in water, even shallow water, poses a safety risk
Active psychosis: Sensory deprivation may worsen psychotic symptoms
Severe, untreated claustrophobia: If you cannot tolerate the environment even with the lid open
Infectious conditions: Gastroenteritis, conjunctivitis, or other communicable diseases
Under the influence of alcohol or recreational drugs: Impaired judgment and altered consciousness

Relative Contraindications (Require Physician Clearance)

Pregnancy: Limited safety data. Most centers allow floating after the first trimester with physician approval. The buoyancy can provide welcome physical relief for pregnant women, but the experience should be discussed with your OB/GYN.
Kidney disease: Magnesium is absorbed transdermally (to some degree), which may be relevant for people with impaired renal function.
Low blood pressure: The relaxation response may lower blood pressure further. Stand up slowly after your session.
Recent tattoo or piercing: Wait until fully healed (2-4 weeks for tattoos, varies for piercings).
Colored or chemically treated hair: Wait at least 7 days after treatment. Fresh dye may leach into the water.
Menstruation: Most centers allow floating with appropriate menstrual products (tampon or menstrual cup), same as swimming.

Water Quality and Hygiene

How Float Centers Maintain Clean Water

Water hygiene is the most common concern for prospective floaters. Here is how reputable centers address it:

High salt concentration: The 25-30% Epsom salt solution itself inhibits the growth of most bacteria and pathogens. Few microorganisms can survive in such a hypertonic environment.
UV sterilization: Ultraviolet light kills bacteria, viruses, and other pathogens as water passes through the filtration system.
Microfiltration: Water passes through filters that remove particles down to 1-10 microns between every session.
Chemical sanitizer: A small amount of hydrogen peroxide, bromine, or chlorine provides residual sanitizing capacity.
Full-volume filtration: The entire tank water volume is filtered multiple times between sessions (typically 3-4 complete cycles).
Regular water testing: pH, sanitizer levels, and specific gravity are tested daily at reputable centers.

Red Flags to Watch For

Avoid float centers that:

Cannot or will not discuss their water treatment protocols
Do not require a pre-float shower
Have visible debris, discoloration, or odor in the water
Do not provide earplugs
Skip the health screening questionnaire

Frequently Asked Questions

Can I float if I just ate?

Wait 1-2 hours after a meal. Lying flat on a full stomach can cause discomfort and mild nausea. A light snack is fine.

Is floating safe for people with anxiety?

Yes — and it may be particularly beneficial. The 2018 Feinstein study specifically enrolled people with anxiety disorders and found that none experienced worsening symptoms. People with the most severe anxiety actually benefited the most. If you are anxious about the experience itself, start with the lid open and a dim light on.

Can I get stuck in the tank?

No. Float tanks are not locked — you can open the lid or door at any time with minimal effort. There is no mechanism that could trap you inside.

Is the salt bad for my skin?

Epsom salt (magnesium sulfate) is generally beneficial for skin — it is a common ingredient in bath products for its soothing properties. However, it can be drying with extended exposure. Shower thoroughly after floating and apply moisturizer.

What if I have a medical condition not listed here?

Consult your physician before floating. Most medical conditions are compatible with float therapy, but your doctor can assess your specific situation and provide personalized guidance. Bring a list of your conditions and medications to the conversation.

The Safety Summary

Float therapy is one of the lowest-risk wellness practices available. The most common side effects (salt eye irritation, ear discomfort) are minor and easily preventable. Serious adverse events are essentially unreported in the clinical literature. For the vast majority of adults, floating is safe, comfortable, and beneficial. The key is choosing a reputable center that maintains proper water quality, provides thorough orientation, and screens for contraindications.