What does hydrotherapy mean?
Hydrotherapy is the therapeutic use of water to treat health conditions, relieve symptoms, or support rehabilitation. Its forms include warm-water immersion, swimming and exercise in a pool, bathing, and the use of water jets. A physiotherapist or other health professional may recommend it for people recovering from injury or surgery, managing chronic pain, or experiencing limited mobility because buoyancy reduces pressure on joints while warm water can relax muscles. The term also covers some older water-based treatments used for conditions such as rheumatism. In modern clinical settings, hydrotherapy is closely associated with supervised aquatic exercise in a dedicated pool, but that is only one part of its broader meaning. The word is formal and belongs primarily to medicine, physiotherapy, and rehabilitation. Its combination of Greek roots for “water” and “treatment” makes its meaning unusually transparent and memorable.
nounThe therapeutic use of water in treating health conditions, especially through bathing, immersion, swimming, or jets.
- The medical or therapeutic use of water, particularly water applied externally through baths, immersion, or pressurized jets, to treat a health condition or support rehabilitation.
"Her physiotherapist recommended hydrotherapy to ease the stiffness in her injured knee."
"The hospital uses hydrotherapy to help patients regain strength and mobility."
"After surgery, she underwent hydrotherapy in a warm pool under a therapist's supervision."
The plural is possible but uncommon; singular usage is usually preferred when discussing the treatment generally.
"The clinic offers hydrotherapies tailored to different rehabilitation needs."
Hydrotherapy literally means “water treatment”: its name joins the Greek words for water and therapy.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hydrotherapy come from?
Hydrotherapy was formed in 19th-century English from hydro-, derived from Greek hudōr meaning “water,” and therapy, which comes from Greek therapeia meaning “treatment” or “service.” The English medical term developed as scientific treatments using water became increasingly systematized. Its components also appear in words such as hydraulic and hydrogen, from the water root, and therapeutic and therapist, from therapeia.
Related word forms
How hydrotherapy is actually used
Hydrotherapy is primarily a formal medical and therapeutic term. In everyday speech, it is sometimes understood more narrowly as exercise in a warm pool, although the word also covers other water-based treatments.