Where the word comes from

Yoga takes its name from the Sanskrit yuj — to yoke, to join. What is being joined is the individual practitioner and something larger than them. Its roots are Indian, its earliest references appear in the Vedas, and for most of its history it was practised as a route to spiritual alignment rather than as a health intervention.

That emphasis shifted. After 1947, rapid modernisation brought a much stronger orientation towards medical models of health — and with it a concept that sociologists including Irving Zola, Peter Conrad and Thomas Szasz named in the 1970s: medicalisation.

What medicalisation means, and why it provokes the question

Medicalisation is the process by which ordinary human experiences come to be defined, and then treated, as medical conditions. Grief acquires a duration. Shyness acquires a diagnosis. Difficulty sleeping acquires a prescription.

The critique is not that medicine is wrong. It is that when a complex human experience is compressed into a medical problem, something goes missing — the context, the meaning, and often the person’s own account of what is happening to them. It is out of that unease that the question arises: could a practice like yoga offer a more humanistic route towards healing?

Yoga is larger than the mat

Yoga is not a set of positions. It is a philosophy, a discipline and a way of living, and it is called holistic because of the eight limbs set out by Patanjali in the Yoga Sutras (2.29). Each limb has a plain psychological counterpart.

  • Yama — ethical discipline, and the compassion that follows from it.
  • Niyama — personal discipline, and the habit of self-reflection.
  • Asana — posture, which releases physical tension and builds body awareness.
  • Pranayama — breath control, which works on emotional regulation through the autonomic nervous system.
  • Pratyahara — withdrawal of the senses, which lowers reactivity to distraction.
  • Dharana — concentration, and the capacity for sustained attention.
  • Dhyana — meditation, and emotional balance.
  • Samadhi — self-realisation, close to what psychology would call self-actualisation.

Read as a whole, the eight limbs describe a practice aimed at self-awareness, emotional regulation and a balanced way of living. The outcomes practitioners report — better physical health, lower stress, clearer thinking, better sleep, more energy, steadier self-discipline — follow from the whole system rather than from any single posture.

What the body actually does

Claims of this kind need evidence, and here there is some.

Slow, controlled breathing activates the parasympathetic branch of the autonomic nervous system — the “rest and digest” side. This is not metaphorical. It is a measurable shift in how the body is running, and it lowers physiological stress.

Meditation and sensory withdrawal have been associated with lower cortisol, the body’s principal stress hormone. Breath control has also been linked to increased alpha brain-wave activity, the pattern associated with being relaxed and alert at once. Malhotra et al. (2021) found that experienced practitioners showed lower delta activity alongside raised theta, alpha and beta — deep relaxation held together with sustained focus, rather than instead of it.

Posture work improves mobility, and appears to reach brain chemistry as well. Streeter et al. (2010) found that a sixty-minute yoga session produced greater increases in brain GABA — the neurotransmitter that quietens neural activity — than an hour of walking.

So: yoga instead of medication?

No — and the question deserves a better answer than a slogan.

Medication is an essential part of treatment for many people and is indispensable in severe mental illness. Nothing in the research above suggests otherwise, and framing yoga as a replacement puts people at risk.

What the evidence does support is that yoga reaches things medication does not: the physiology of stress, a person’s relationship with their own body, and the capacity to notice what is happening before it becomes overwhelming. It works on underlying causes as well as symptoms, and it does so slowly.

No one’s mental health responds to a universal protocol. The sensible framing is not opposition but combination — evidence-based medical treatment where it is warranted, holistic practice alongside it, and a plan built around a particular person rather than a category.

What this means in practice

If you are considering yoga as part of how you look after your mental health:

  • Treat it as complementary, not as a substitute. Speak to whoever is prescribing before you change anything.
  • Start with the breath. Pranayama has the most direct and best-evidenced effect on the nervous system, and it asks for no flexibility at all.
  • Judge it over months. The physiological changes are real but gradual, and one class is not a fair test.
  • If a class leaves you feeling worse — exposed, compared, unsafe in your own body — that is information about the class, not about you.