Mastering Changes in medicine, c1848-c1948: Edexcel IGCSE History Study Notes

Changes in medicine, c1848-c1948, traces one hundred years of extraordinary progress in medical science, public health and surgery, driven by individuals, wars and shifting attitudes towards government responsibility for health.

This topic sits within Paper 2 of the Pearson Edexcel IGCSE History specification (4HI1) as a Breadth Study in Change. Paper 2 carries 60 marks and lasts 90 minutes. Breadth Studies require you to identify and explain patterns of change across the period, connecting individual breakthroughs to wider developments in science, technology and political will.

The following edexcel igcse history revision notes cover every specified area of this topic. The chronological structure mirrors the specification, making it straightforward to check your coverage against what the exam can test.

Progress in the mid-19th century

In 1848, medicine was still constrained by significant barriers to progress. The causes of disease were not understood; the prevailing miasma theory held that illness was caused by "bad air" from rotting organic matter. Surgery was performed without anaesthesia or antiseptics, and mortality rates from surgical infection were appallingly high. Public health infrastructure was rudimentary, and government intervention in health matters was resisted on ideological grounds.

Florence Nightingale transformed nursing from a disreputable occupation into a respected profession. During the Crimean War (1854-56), she took charge of the British military hospital at Scutari, where conditions were filthy and the death rate from disease far exceeded that from battle wounds. Nightingale insisted on cleanliness, proper ventilation, nutritious food and organised record-keeping. She used statistical analysis to demonstrate that improved hygiene reduced mortality, presenting her findings in pioneering pie charts to persuade government officials. After the war, she established the Nightingale Training School at St Thomas' Hospital in London in 1860, setting new standards for nurse education.

James Young Simpson introduced chloroform as an anaesthetic in 1847, having previously experimented with ether. Chloroform allowed surgeons to perform longer and more complex operations because patients were unconscious and still. Opposition came from religious groups who argued that pain was God's will, and from some surgeons who worried that unconscious patients could not report symptoms during operations. Queen Victoria's use of chloroform during childbirth in 1853 helped make it socially acceptable.

Edwin Chadwick's 1842 Report on the Sanitary Condition of the Labouring Population established a clear link between poverty, unsanitary conditions and disease. His work contributed to the first Public Health Act of 1848, which created a Central Board of Health and allowed local boards to be established. However, the Act was permissive rather than compulsory, and many areas ignored it. The Board was abolished in 1858 after fierce opposition from those who saw public health as government interference.

John Snow's investigation of the 1854 Broad Street cholera outbreak in London provided crucial evidence against the miasma theory. Snow mapped cholera cases and traced the outbreak to a contaminated water pump. His work was a landmark in epidemiology, though the miasma theory was not definitively replaced until Pasteur's germ theory gained acceptance in the 1860s.

Discovery and development, 1860-75

Louis Pasteur's germ theory, published in 1861, was a turning point in the history of medicine. Through experiments with swan-necked flasks, Pasteur demonstrated that microorganisms in the air caused decay, not spontaneous generation. His work proved that specific germs caused specific diseases, opening the door to targeted prevention and treatment.

Joseph Lister applied Pasteur's ideas to surgery. In 1867, he began using carbolic acid as an antiseptic, spraying it during operations and on wounds and dressings. His results were dramatic: post-operative infection rates fell sharply. However, many surgeons resisted his methods. Carbolic spray was unpleasant, irritated the skin, and some surgeons dismissed germ theory as unproven. Lister's persistence and published results gradually won converts.

The Public Health Act of 1875 was far more effective than its 1848 predecessor because it was compulsory. Local authorities were required to provide clean water, proper drainage, sewage systems and to appoint Medical Officers of Health. It reflected a growing acceptance that government had a duty to protect public health.

Elizabeth Garrett Anderson became the first woman to qualify as a doctor in Britain in 1865, having found a loophole in the regulations of the Society of Apothecaries. She later helped establish the London School of Medicine for Women in 1874. Her career opened doors for women in medicine, though progress remained slow and opposition significant.

Accelerating change, 1875-1905

Robert Koch, working in Berlin, identified specific bacteria responsible for individual diseases: anthrax (1876), tuberculosis (1882) and cholera (1883). His methods of staining bacteria, growing them in pure cultures, and using photography to record findings established bacteriology as a scientific discipline. Koch's team and Pasteur's team became fierce rivals, driving the pace of discovery.

Aseptic surgery replaced antiseptic surgery during this period. Rather than killing germs after they entered a wound, aseptic techniques prevented them from entering in the first place: sterilised instruments, surgical gowns and masks, and operating theatres cleaned with steam. Surgical mortality continued to fall.

Blood transfusions remained dangerous because the mechanism of blood types was not yet understood; Karl Landsteiner identified the ABO blood groups in 1901, making safe transfusion possible for the first time.

Paul Ehrlich, one of Koch's former students, pioneered the concept of "magic bullets": chemical compounds that would target specific disease-causing microorganisms without harming the rest of the body. In 1909, his team developed Salvarsan 606 (arsphenamine), the first effective treatment for syphilis. It was toxic and difficult to administer, but it proved the principle that chemical drugs could cure infectious diseases.

Marie Curie's research into radioactivity, for which she won Nobel Prizes in both Physics (1903) and Chemistry (1911), laid the groundwork for the use of X-rays and radiation in medical diagnosis and treatment.

Government action and war, 1905-20

The Liberal welfare reforms of 1906-14 represented a decisive expansion of government responsibility for health. Free school meals (1906), school medical inspections (1907), old-age pensions (1908) and National Insurance (1911) all addressed the finding that a significant proportion of army recruits during the Boer War had been rejected as physically unfit. The reforms did not create universal healthcare, but they established the principle that the state should protect the most vulnerable.

The First World War (1914-18) accelerated medical progress in several areas:

• Surgery: The scale of injuries from shrapnel and machine-gun fire drove advances in techniques for treating wounds, fractures and facial injuries. Harold Gillies pioneered plastic surgery for soldiers with devastating facial wounds.
• Blood transfusion: The need to treat massive blood loss on the battlefield led to practical advances in storing and transfusing blood. Sodium citrate was used to prevent clotting, and blood banks were established near the front lines.
• X-rays: Mobile X-ray units, some operated by Marie Curie herself, allowed doctors to locate bullets and shrapnel fragments without exploratory surgery.
• Women in medicine: With male doctors serving at the front, women gained access to medical roles previously closed to them. The war demonstrated their competence and weakened resistance to their professional advancement.

Advances in medicine, surgery and public health, 1920-48

The discovery of penicillin is a story of accident, persistence and wartime necessity. Alexander Fleming noticed in 1928 that a mould (Penicillium notatum) had killed bacteria in a petri dish left uncovered in his laboratory at St Mary's Hospital, London. He published his findings but lacked the resources and biochemical expertise to develop the mould into a usable drug.

Howard Florey and Ernst Chain at Oxford University took up the challenge in 1938. By 1941, they had produced enough penicillin to test on a human patient, Albert Alexander, a policeman dying of septicaemia. The drug produced a dramatic improvement, but supplies ran out and Alexander died. The difficulty of mass-producing penicillin was solved with American industrial support during the Second World War. By D-Day (June 1944), enough penicillin was available to treat all Allied wounded who needed it.

The Second World War (1939-45) again drove medical advances. Penicillin saved thousands of lives from infected wounds. Blood transfusion techniques were further refined. The National Blood Transfusion Service was established in Britain in 1946. Advances in surgical treatment of burns, psychiatric understanding of combat trauma, and the use of DDT to control disease-carrying insects all emerged from wartime necessity.

William Beveridge's 1942 report identified five "giant evils" afflicting British society: Want, Disease, Ignorance, Squalor and Idleness. His recommendations formed the blueprint for the post-war welfare state, including the National Health Service (NHS). The NHS, launched on 5 July 1948 by Health Minister Aneurin Bevan, provided free healthcare at the point of use for the entire population, funded through taxation. For the first time, access to medical care was not determined by the ability to pay. The NHS was and remains the most significant single development in British public health.

Common mistakes and how to avoid them

• Listing discoveries without explaining their significance: Knowing that Pasteur developed germ theory is not enough for edexcel igcse history notes at this level. You need to explain how it changed medical understanding and enabled developments like antiseptic surgery and vaccines.
• Ignoring the role of government: Individual discoveries were essential, but without government action (Public Health Acts, Liberal reforms, NHS), their benefits would not have reached the general population.
• Treating change as inevitable: Every breakthrough faced opposition. Lister's antiseptics, Simpson's chloroform, and the NHS all encountered resistance. Strong answers acknowledge barriers as well as breakthroughs.
• Neglecting the breadth study format: This topic spans a century, and the exam may ask you to identify the most significant turning point or to compare rates of change across the period. Practise writing answers that cover the full chronological range.

Self-check questions

1. What were the main barriers to medical progress in the mid-19th century?
2. How did Pasteur's germ theory transform the understanding of disease?
3. Compare the Public Health Acts of 1848 and 1875. Why was the later Act more effective?
4. What impact did the First World War have on medicine and surgery?
5. Why was the development of penicillin dependent on wartime conditions?
6. What was the significance of the NHS, and why was it controversial?

If you can answer each of these with precise factual detail and a clear analytical thread, you are well prepared for the changes in medicine, c1848-c1948 edexcel igcse section of your exam. For further igcse 4hi1 changes in medicine, c1848-c1948 study resources, the Green Bridge CBT platform offers edexcel igcse history revision notes and practice questions that let you rehearse under timed conditions. Medical history rewards the student who can connect individual breakthroughs to their wider context, and that skill only sharpens with practice.