THERAPIES & TRADITIONS · COMPARED
Hydrotherapy, Balneotherapy and Spa Therapy Compared
How hydrotherapy, balneotherapy and spa therapy are used and where the terms overlap, what trials of each have found, and why this comparison has no winner.
Content last updated . This page has not been medically reviewed.
Back to HydrotherapySafety comes first with any of them. Hot water, cold water and mineral baths each carry risks; see hydrotherapy safety and the list of who should check with a clinician in preparing for hydrotherapy.
How the terms are defined
- Hydrotherapy. The National Library of Medicine's indexing note describes it as external use of natural water only, with emphasis on water temperature and motion of water [1]. It is an indexing note, not a clinical standard. Day to day the word covers many things: baths, showers, aquatic exercise, hot tubs and cold water. See what is hydrotherapy.
- Balneotherapy (balneology). The same indexing system says to differentiate it from hydrotherapy where the emphasis is on plain water rather than natural mineral water [2]. In practice it usually means bathing in natural mineral or thermal water, often in a clinical spa setting. See balneotherapy in Europe.
- Spa therapy. One 2024 review describes spa therapy as multiple techniques based on the healing effects of water, including hydrotherapy, balneotherapy and mud therapy [3]. A 2005 review used "balneotherapy or spa therapy" as two names for bathing in water [4]. A "spa day" at a wellness resort is a different thing from a prescribed, supervised program; the word spa covers both, which is part of the confusion.
Side by side
| Hydrotherapy | Balneotherapy | Spa therapy | |
|---|---|---|---|
| Water | Plain or natural water, as the indexing note puts it [1] | Natural mineral or thermal water, as the indexing note puts it [2] | Water-based techniques, sometimes combined with exercise, massage or physical therapy [3] |
| Typical setting | Home, pool, clinic, rehabilitation | Spa towns and clinics | Spa centers and clinical spa programs |
| Evidence status | Varies by use; see below | Mixed and limited | Limited; mostly small studies |
The setting row is a general description, not a finding from a source; settings vary by country.
What trials found under each name
- Balneotherapy for rheumatoid arthritis. A Cochrane review (abridged version) included nine studies with 579 participants and concluded that overall evidence is insufficient to show balneotherapy is more effective than no treatment [5]. One study compared seated-immersion balneotherapy with exercises in water (hydrotherapy), land exercise or relaxation, and found no statistically significant differences in pain or disability, at very low certainty [5]. Evidence label for this use: insufficient evidence.
- Stress and cortisol. A 2018 systematic review of 15 studies (684 subjects) says balneotherapy and spa therapy may be considered useful for stress conditions, and also says further investigation is needed because of limited data [6]. A 2024 update with a meta-analysis found a trend to lower stress hormone levels in the intervention group that did not reach statistical significance [7]. Evidence label: promising but limited. Cortisol is a lab marker, not the same as feeling better.
- Spa therapy and brain chemicals. A 2024 systematic review found only four studies, very heterogeneous and of low quality, so clear conclusions were not possible [3]. Evidence label: insufficient evidence.
Water-based trials cannot be blinded, and spa trials often involve travel, rest and a change of scene, so those other things may account for part of any benefit. Reading tips are on how hydrotherapy is studied. Wider Cochrane and guideline views are on Cochrane and guideline views.
Choosing between them
There is no source we read that ranks the three for a given problem. Questions that matter more than the label:- What is the goal (comfort, movement after injury, a skin or joint condition)?
- What does the program involve, and who supervises it?
- Is there a published human trial for that use, and how big was it?
- Do you have a condition that needs a clinician's approval first?
We do not list or rank spas or clinics. For checking a facility, see how to check a pool, spa or clinic and spa and facility safety checks.
Related pages
Frequently asked questions
Is balneotherapy the same as hydrotherapy?
Not exactly. The indexing system separates balneology (natural mineral water) from hydrotherapy (plain water, with emphasis on temperature and motion), though authors mix them. [2]
Is spa therapy the same as a spa day?
Reviews describe spa therapy as water-based techniques sometimes combined with exercise or massage. A spa day at a wellness resort is not described in the sources we read. [3]
Which one works best?
We found no head-to-head comparison. A Cochrane review of balneotherapy for rheumatoid arthritis found insufficient evidence. [5]
Do these treat disease?
They are not shown to cure disease. For some conditions, small studies report symptom changes. [6]
Can I use one instead of my medicines?
No. Do not stop or change medicines or delay care. Use water therapy only as an add-on, and ask a clinician first if you have a health condition.
References
- National Library of Medicine. MeSH descriptor: Hydrotherapy (indexing note). Read 2026-10-22.
- National Library of Medicine. MeSH descriptor: Balneology (indexing note). Read 2026-10-22.
- Galvez et al. Spa therapy and peripheral serotonin and dopamine function: a systematic review. Int J Biometeorol 2024. PubMed 37950094. Read 2026-10-22.
- Nasermoaddeli et al. Balneotherapy in medicine: a review. Environ Health Prev Med 2005. PubMed 21432136. Read 2026-10-22.
- Verhagen et al. Balneotherapy (or spa therapy) for rheumatoid arthritis, abridged Cochrane review. Eur J Phys Rehabil Med 2015. PubMed 26158921. Read 2026-10-22.
- Antonelli et al. Effects of balneotherapy and spa therapy on levels of cortisol as a stress biomarker: a systematic review. Int J Biometeorol 2018. PubMed 29455296. Read 2026-10-22.
- Antonelli et al. Balneotherapy and cortisol levels: an updated systematic review and meta-analysis. Int J Biometeorol 2024. PubMed 38884799. Read 2026-10-22.