Medieval Medicine c1250–c1500

Medieval medicine is often dismissed as primitive. That judgement misses the point the Edexcel specification wants you to make. Medieval medical practice was systematic, intellectually coherent within its own framework, and remarkably resistant to change. To understand why it lasted so long — and why challenge to it was so slow — you need to understand three things: the ideas medieval practitioners held about disease, the treatments those ideas produced, and the institutions (Church, guild, university) that reproduced them generation after generation.

This lesson covers the period roughly c1250 to c1500. It explains the Theory of the Four Humours inherited from Hippocrates and Galen, the competing explanations of miasma and the supernatural, the work of practitioners from physicians to wise women, the responses to the Black Death of 1348–50 as the period's great stress test, and the religious character of medieval hospitals. Throughout, keep the factors framework in mind: religion and the Church, individuals (rarely innovative in this period), and the near-total absence of government and science/technology as drivers of change.

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Ideas about disease

Medieval explanation of disease drew on three overlapping frameworks: Greek humoral theory, environmental miasma, and Christian and supernatural beliefs.

The Four Humours

The Theory of the Four Humours was first set out by Hippocrates (c460–c370 BC) and elaborated by Galen (c129–c216 AD). Galen's works were preserved and expanded by scholars in the Islamic world, translated into Latin from around the eleventh century, and then taught in European universities as medical orthodoxy.

The theory held that the body contained four fluids or "humours": blood, yellow bile, black bile and phlegm. Health was the balance of these humours. Illness was imbalance. Each humour was associated with an element, a season, and a set of qualities.

Humour	Element	Season	Qualities	Associated organ
Blood	Air	Spring	Hot and wet	Heart
Yellow bile	Fire	Summer	Hot and dry	Liver
Black bile	Earth	Autumn	Cold and dry	Spleen
Phlegm	Water	Winter	Cold and wet	Brain

Galen added the Theory of Opposites: an excess of one humour was treated by applying its opposite. Too much phlegm (cold and wet) was treated with hot, dry foods or activity. Too much blood was treated by bloodletting.

Galen's authority was near-absolute for more than a thousand years because:

• His writing was systematic and comprehensive.
• The medieval Church endorsed his ideas, partly because his references to a single creator fitted Christian theology.
• Universities taught his books as set texts.
• There was no alternative framework capable of replacing him.

Miasma

Miasma theory held that disease was caused by bad air from rotting matter, swamps, or corpses. It did not contradict humoral theory — bad air could throw the humours out of balance — and it offered a persuasive explanation for why disease seemed to cluster in dirty or low-lying places. Miasma theory persisted well into the nineteenth century and shaped public health responses even after Germ Theory had been proposed.

Religion and the supernatural

Christian Europe saw disease as punishment from God for sin, as a test of faith, or as the work of demons. Pilgrimages, prayer, confession, and the wearing of religious symbols were standard responses. Astrology was also a recognised medical tool: physicians consulted vademecum books to match treatments to the patient's star chart. None of these beliefs were seen as superstition at the time; they fitted coherently with Galenic medicine under the Church's umbrella.

How the frameworks fitted together

flowchart TD
    A[Disease] --> B[Natural causes]
    A --> C[Supernatural causes]
    B --> D[Imbalance of humours]
    B --> E[Miasma / bad air]
    C --> F[God's punishment]
    C --> G[Astrological misalignment]
    D --> H[Treatment: bleed, purge, diet]
    E --> I[Treatment: clean streets, burn herbs]
    F --> J[Treatment: prayer, pilgrimage, flagellation]
    G --> K[Treatment: amulets, timed remedies]

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Treatments

Medieval treatments followed directly from medieval ideas. If illness was imbalance of the humours, treatment rebalanced them. If it was bad air, you cleaned the air. If it was divine punishment, you prayed.

Treatment	Rationale	Typical practitioner
Bloodletting (venesection, leeches)	Remove excess blood to rebalance humours	Barber-surgeon
Purging (laxatives, emetics)	Expel excess bile or phlegm	Apothecary or physician
Herbal remedies	Match qualities of herb to imbalance (hot, cold, wet, dry)	Apothecary, wise woman
Theriac (multi-ingredient compound)	Universal remedy, sometimes containing dozens of herbs and minerals	Apothecary
Prayer, pilgrimage, relics	Appeal to divine mercy	Priest, religious community
Astrological timing	Align treatment with favourable stars	Physician
Urine examination (uroscopy)	Diagnose humour imbalance by colour, smell, taste	Physician

Some herbal remedies worked by accident — willow bark, which contains an aspirin-like compound, was used for pain. But the framework of treatment was not experimental: if a patient recovered, the physician credited the humoral balance; if the patient died, it was God's will.

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Practitioners

Medical practice was hierarchical. Who you saw depended on who you were and where you lived.