The Black Death & Public Health in Medieval England
The Arrival of the Black Death
In 1348, a devastating plague arrived in England through the port of Melcombe Regis in Dorset, carried by fleas on black rats aboard trading ships from continental Europe. By the end of 1349, the Black Death had killed between one-third and one-half of England’s population — an estimated 1.5 million people out of roughly 4 million. It was the greatest demographic catastrophe in English history.
The Black Death (1348–49) killed an estimated one-third to one-half of England’s population. It took over 200 years for the population to recover to pre-plague levels.
The disease took two forms. Bubonic plague was spread by flea bites and caused swollen lymph nodes called buboes, along with fever, vomiting, and blackened skin. Pneumonic plague attacked the lungs and spread through coughs and sneezes — it was almost always fatal within days. Nobody in medieval England understood that the disease was caused by the bacterium Yersinia pestis, carried by fleas on rats.
What Did People Think Caused the Black Death?
Because medieval people did not understand germs or bacteria, they looked to the explanations they already trusted. The most common explanations were:
- God’s punishment — many believed the plague was divine retribution for humanity’s sins. Flagellants whipped themselves in public processions, hoping to earn God’s forgiveness.
- Miasma (bad air) — the foul smell of rotting bodies and waste convinced many that poisonous air was spreading the disease.
- Astrology — the University of Paris medical faculty blamed a conjunction of Mars, Jupiter, and Saturn in 1345 for corrupting the atmosphere.
- The Four Humours — some physicians believed the plague was caused by an imbalance that made the body vulnerable to corrupted air.
Treatment Attempts
Treatments during the Black Death reflected the limited understanding of disease. Because people believed in different causes, they tried a range of approaches:
Bloodletting and lancing buboes — physicians attempted to rebalance the humours by cutting patients and draining blood, or by bursting the swollen buboes. Purging with laxatives was also used. Theriac (a mixture of up to 70 ingredients including opium and viper flesh) was applied to buboes or swallowed. Carrying posies of flowers and burning sweet-smelling herbs aimed to purify the miasma. Prayer and religious rituals — attending church, confessing sins, and going on pilgrimage were the most common responses for ordinary people.
None of these treatments worked because they were based on incorrect theories about the cause of disease. Bloodletting weakened patients further, and bursting buboes could actually spread infection.
Prevention Attempts
Prevention attempts were equally limited, though some had unintentional benefits:
Fleeing Infected Areas
Wealthy people fled towns for the countryside, which sometimes saved them — though they could unknowingly carry the disease with them.
Quarantine Measures
Some towns attempted to isolate the sick by boarding up houses with infected families inside. In 1377 the port of Ragusa (modern Dubrovnik) introduced a 30-day isolation period for arriving ships.
Cleaning Streets
Authorities in some towns ordered waste and refuse to be removed, believing miasma caused the plague. London’s streets were cleaned and butchers banned from dumping offal in the Thames.
Although prevention measures like quarantine and street cleaning were based on incorrect theories (miasma), they sometimes accidentally reduced the spread of disease by improving hygiene or limiting contact between people.
The Role of the Church in Healthcare
The Church played a central but complicated role in medieval healthcare. On one hand, it was the main provider of hospitals and care for the sick — monasteries and nunneries ran over 1,100 hospitals in England by 1350. Monks and nuns provided food, shelter, and prayers to the poor and elderly. The Church also preserved ancient medical texts by scribes copying manuscripts in monastery libraries.
Helped: Ran hospitals, cared for the poor, preserved Galen’s medical texts, trained some physicians at Church-run universities.
Hindered: Promoted the idea that disease was God’s punishment, discouraged dissection (which prevented anatomical discovery), insisted Galen’s ideas were correct and punished those who challenged them, focused on spiritual care rather than medical treatment.
Impact of the Black Death on Medieval Medicine
The Black Death exposed the failure of medieval medicine. Physicians could not explain, treat, or prevent the plague. Public trust in doctors declined. However, the plague did have some longer-term consequences: the massive loss of population led to labour shortages, which eventually gave surviving peasants more power and higher wages. Some historians argue the Black Death began to weaken the authority of the Church, because people questioned why God had allowed such suffering — though this was a very slow process.
The Black Death did not lead to immediate improvements in medical knowledge. The same theories (Four Humours, miasma, God’s punishment) continued to dominate for centuries. Change in medicine was extremely slow.