Care for the sick as an organised institution has a traceable history running through religious communities in several traditions.
Early foundations
Institutions established by religious communities to care for the sick and travelling.
Which combined hospitality and medicine.
Islamic hospitals
Institutions with teaching, wards and pharmacies from the medieval period.
Which influenced later European practice.
Nursing orders
Religious communities providing organised nursing.
Which continued into the modern era.
Secularisation
State and municipal provision replacing religious foundations.
Hospitality and medicine together
The word hospital shares a root with hospitality, and the institutions began as places of shelter as much as treatment.
Which is why they were attached to religious houses along travel and pilgrimage routes.
Care for the poor, the traveller and the sick was frequently a single undertaking rather than three.
Medieval Islamic institutions
Hospitals with specialised wards, teaching functions and salaried physicians.
Which were sophisticated by the standards of their period.
Monastic infirmaries
Care within religious communities extending to outsiders.
Nursing as vocation
Religious orders providing organised nursing for centuries.
Which shaped the profession's later development.
The modern relationship
Faith-based hospitals continuing alongside state systems.
Why this history is worth knowing
The idea that a society should maintain institutions caring for strangers who cannot pay is not obvious and did not arise everywhere.
Which makes its actual origins historically interesting rather than merely edifying.
Religious obligation to care for the sick and the traveller was the mechanism through which much of it developed.
Teaching and record keeping
Institutions maintaining libraries and training practitioners.
Which produced continuity of medical knowledge.
Charitable endowment
Foundations funded to operate in perpetuity.
Which some still do.
Modern faith-based provision
Significant healthcare delivery in many countries.
Which raises its own contemporary questions.
Further reading
Medical history is a well developed academic field with accessible general works.
What changed with secularisation
Funding moved from endowment and charity to taxation and insurance, and staffing from vocation to profession.
Which transformed both the scale and the character of provision, mostly for the better in terms of coverage.
What was arguably lost was an explicit account of why caring for strangers was obligatory, which modern systems tend to assume rather than argue.
Chaplaincy
Religious care continuing within secular institutions.
Which is now generally multi-faith.
Hospices
The modern movement founded within an explicitly religious framework.
Which has since become largely secular.
Global health
Faith-based organisations delivering substantial care in some regions.
Further reading
Histories of medicine and of charitable institutions cover this well.
How this article treats its subject
Everything here is written descriptively. Where a practice belongs to a living religious tradition, the aim is to say accurately what that tradition does and says about it, without arguing for or against its beliefs. Those are questions for the traditions themselves and for the people who belong to them.
Where research is mentioned, the intention is to report what studies have found rather than what enthusiasts or critics have claimed about them, including where the findings are weaker or more contested than popular coverage suggests.
A note on why the history matters
A great deal of contemporary spiritual and wellbeing material presents itself as ancient when it is recent, or as universal when it belongs to a particular tradition and place. Neither of those is necessarily dishonest, and both make it harder to understand what one is actually doing.
Knowing where a practice comes from, who developed it, what it was originally for and what changed along the way does not diminish it. It usually makes it more interesting, and it makes claims about it easier to evaluate.
Where to read further
Primary texts in good annotated translations, academic histories, and practitioners speaking about their own tradition are all more reliable than secondary summaries, including this one. Most of the traditions discussed here have extensive scholarly literature accessible to general readers, and university presses publish short introductory volumes on nearly all of them.
Where a practice has physical or psychological effects, medical and mental health professionals are the appropriate source of guidance, and nothing here is intended as advice of that kind.
On sources and disagreement
Scholars disagree about much of this material, sometimes sharply, and where that is the case it has been noted rather than resolved. Presenting contested questions as settled would be more comfortable to read and less accurate.
That applies particularly to questions of origin and influence, where the evidence is frequently thin and the temptation to fill gaps with a tidy narrative is strong. Where something is genuinely uncertain, the honest description is that we do not know.
A final word on approach
Traditions described here belong to living communities of people who practise them seriously. Writing about them from outside carries an obligation to get the details right and to avoid claiming more familiarity than the writing supports.
Where this article is thin, the traditions own sources are the correction.