Leeches had advantages over the common practice of bloodletting using a lancet – the loss of blood was more gradual and less of a shock for those of delicate constitution. And because Broussais’s followers used leeches in place of all the other medicines at the 19th-century physician’s disposal, patients were spared some harsh remedies that might otherwise have made them feel worse. In 1822, a British surgeon called Rees Price coined the term sangui-suction for leech therapy.

During the Renaissance, understanding of anatomy improved, and the microscope was invented. Prior to the 19th century, humorism (also known as humoralism) was thought to explain the cause of disease but it was gradually replaced by the germ theory of disease, leading to effective treatments and even cures for many infectious diseases. Military doctors advanced the methods of trauma treatment and surgery. Public health measures were developed especially in the 19th century as the rapid growth of cities required systematic sanitary measures. Advanced research centers opened in the early 20th century, often connected with major hospitals. The mid-20th century was characterized by new biological treatments, such as antibiotics. These advancements, along with developments in chemistry, genetics, and radiography led to modern medicine. Medicine was heavily professionalized in the 20th century, and new careers opened to women as nurses (from the 1870s) and as physicians (especially after 1970).
1901 Austrian-American Karl Landsteiner describes blood compatibility and rejection (i.e., what happens when a person receives a blood transfusion from another human of either compatible or incompatible blood type), developing the ABO system of blood typing. This system classifies the bloods of human beings into A, B, AB, and O groups. Landsteiner receives the 1930 Nobel Prize for Physiology or Medicine for this discovery.
In London, the crown allowed two hospitals to continue their charitable work, under nonreligious control of city officials.[96] The convents were all shut down but Harkness finds that women—some of them former nuns—were part of a new system that delivered essential medical services to people outside their family. They were employed by parishes and hospitals, as well as by private families, and provided nursing care as well as some medical, pharmaceutical, and surgical services.[97]
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Another of Hippocrates's major contributions may be found in his descriptions of the symptomatology, physical findings, surgical treatment and prognosis of thoracic empyema, i.e. suppuration of the lining of the chest cavity. His teachings remain relevant to present-day students of pulmonary medicine and surgery. Hippocrates was the first documented person to practise cardiothoracic surgery, and his findings are still valid.

Nursing was greatly improved by two nurses, Florence Nightingale (1820-1910) and Mary Seacole (1805-1881) who both nursed soldiers during the Crimean War 1853-56. In the USA Clara Barton founded the American Red Cross in 1881. Meanwhile in the 19th century several more hospitals were founded in London including Great Ormond Street Children's Hospital (1852). In 1864 Jean Henri Dunant founded the international Red Cross.

After AD 400, the study and practice of medicine in the Western Roman Empire went into deep decline. Medical services were provided, especially for the poor, in the thousands of monastic hospitals that sprang up across Europe, but the care was rudimentary and mainly palliative.[69] Most of the writings of Galen and Hippocrates were lost to the West, with the summaries and compendia of St. Isidore of Seville being the primary channel for transmitting Greek medical ideas.[70] The Carolingian renaissance brought increased contact with Byzantium and a greater awareness of ancient medicine,[71] but only with the twelfth-century renaissance and the new translations coming from Muslim and Jewish sources in Spain, and the fifteenth-century flood of resources after the fall of Constantinople did the West fully recover its acquaintance with classical antiquity.
3 Schwarz, Richard W. “John Harvey Kellogg, M.D.: Pioneering Health Reformer.” John Harvery Kellogg, M.D.: Pioneering Health Reformer – Richard W. Schwarz – Google Books. Google Books, 2006. Web. 26 Jan. 2014. .
When the Roman Empire split into the Western and Eastern Empires, the Western Empire, centered on Rome, went into a deep decline and the art of medicine slowly slipped away, with the physicians becoming pale shadows of their illustrious predecessors and generally causing more harm than good. Western Europe would not appear again in the history of medicine until long after the decline of Islam.
During the 18th century superstition declined. In 1700 many people believed that scrofula (a form of tubercular infection) could be healed by a monarch's touch. (Scrofula was called the kings evil). Queen Anne (reigned 1702-1714) was the last British monarch to touch for scrofula. Despite the decline of superstition there were still many quacks in the 18th century. Limited medical knowledge meant many people were desperate for a cure. One of the most common treatments, for the wealthy, was bathing in or drinking spa water, which they believed could cure all kinds of illness.

Starting in World War II, DDT was used as insecticide to combat insect vectors carrying malaria, which was endemic in most tropical regions of the world.[178] The first goal was to protect soldiers, but it was widely adopted as a public health device. In Liberia, for example, the United States had large military operations during the war and the U.S. Public Health Service began the use of DDT for indoor residual spraying (IRS) and as a larvicide, with the goal of controlling malaria in Monrovia, the Liberian capital. In the early 1950s, the project was expanded to nearby villages. In 1953, the World Health Organization (WHO) launched an antimalaria program in parts of Liberia as a pilot project to determine the feasibility of malaria eradication in tropical Africa. However these projects encountered a spate of difficulties that foreshadowed the general retreat from malaria eradication efforts across tropical Africa by the mid-1960s.[179]
Kan Aiya, a 60-year-old woman, had lost many loved ones to breast cancer. She had seen her sisters die of the cruel disease, so when a tumour formed in her left breast she was well aware of the likely outcome. For her, however, there was a chance of survival – an operation. It was 1804 and she was in the best possible place for surgery – feudal Japan.

Temples dedicated to the healer-god Asclepius, known as Asclepieia (Ancient Greek: Ἀσκληπιεῖα, sing. Ἀσκληπιεῖον, 'Asclepieion), functioned as centers of medical advice, prognosis, and healing.[36] At these shrines, patients would enter a dream-like state of induced sleep known as enkoimesis (ἐγκοίμησις) not unlike anesthesia, in which they either received guidance from the deity in a dream or were cured by surgery.[37] Asclepeia provided carefully controlled spaces conducive to healing and fulfilled several of the requirements of institutions created for healing.[36] In the Asclepeion of Epidaurus, three large marble boards dated to 350 BCE preserve the names, case histories, complaints, and cures of about 70 patients who came to the temple with a problem and shed it there. Some of the surgical cures listed, such as the opening of an abdominal abscess or the removal of traumatic foreign material, are realistic enough to have taken place, but with the patient in a state of enkoimesis induced with the help of soporific substances such as opium.[37] Alcmaeon of Croton wrote on medicine between 500 and 450 BCE. He argued that channels linked the sensory organs to the brain, and it is possible that he discovered one type of channel, the optic nerves, by dissection.[38]

In the 17th century medicine continued to advance. In the early 17th century an Italian called Santorio invented the medical thermometer. In 1628 William Harvey published his discovery of how blood circulates around the body. Harvey realized that the heart is a pump. Each time it contracts it pumps out blood. The blood circulates around the body. Harvey then estimated how much blood was being pumped each time.

We begin this new series with Sandra Scheinbaum, PhD, founder of the Functional Medicine Coaching Academy. Sandy shares with us how health coaches contribute to the success of a medical practice and what roles they can play to connect with patients and the local community. She also provides guidance on how to transition to an integrative practice that utilizes a health coach. 

Late antiquity ushered in a revolution in medical science, and historical records often mention civilian hospitals (although battlefield medicine and wartime triage were recorded well before Imperial Rome). Constantinople stood out as a center of medicine during the Middle Ages, which was aided by its crossroads location, wealth, and accumulated knowledge. copied content from Byzantine medicine; see that page's history for attribution
Another of Hippocrates's major contributions may be found in his descriptions of the symptomatology, physical findings, surgical treatment and prognosis of thoracic empyema, i.e. suppuration of the lining of the chest cavity. His teachings remain relevant to present-day students of pulmonary medicine and surgery. Hippocrates was the first documented person to practise cardiothoracic surgery, and his findings are still valid.
Cardiology used to be the study of the heart - but in the last couple decade it's been more about the study of cardiac procedures. Not all of these procedures have long term benefits and most just treat the symptoms and do not prevent future events. Dr. Masley looks at this from a preventative and lifestyle medicine perspective and works to educate both patients and practitioners on what they can do to avoid seeing a cardiologist altogether. 

The Ayurvedic classics mention eight branches of medicine: kāyācikitsā (internal medicine), śalyacikitsā (surgery including anatomy), śālākyacikitsā (eye, ear, nose, and throat diseases), kaumārabhṛtya (pediatrics with obstetrics and gynaecology), bhūtavidyā (spirit and psychiatric medicine), agada tantra (toxicology with treatments of stings and bites), rasāyana (science of rejuvenation), and vājīkaraṇa (aphrodisiac and fertility). Apart from learning these, the student of Āyurveda was expected to know ten arts that were indispensable in the preparation and application of his medicines: distillation, operative skills, cooking, horticulture, metallurgy, sugar manufacture, pharmacy, analysis and separation of minerals, compounding of metals, and preparation of alkalis. The teaching of various subjects was done during the instruction of relevant clinical subjects. For example, teaching of anatomy was a part of the teaching of surgery, embryology was a part of training in pediatrics and obstetrics, and the knowledge of physiology and pathology was interwoven in the teaching of all the clinical disciplines. The normal length of the student's training appears to have been seven years. But the physician was to continue to learn.[28]

Upon the outbreak of a cholera epidemic in Alexandria, Egypt, two medical missions went to investigate and attend the sick, one was sent out by Pasteur and the other led by Koch.[116] Koch's group returned in 1883, having successfully discovered the cholera pathogen.[116] In Germany, however, Koch's bacteriologists had to vie against Max von Pettenkofer, Germany's leading proponent of miasmatic theory.[117] Pettenkofer conceded bacteria's casual involvement, but maintained that other, environmental factors were required to turn it pathogenic, and opposed water treatment as a misdirected effort amid more important ways to improve public health.[117] The massive cholera epidemic in Hamburg in 1892 devastasted Pettenkoffer's position, and yielded German public health to "Koch's bacteriology".[117]
Late 1800s: The expectation in the United States that hospitals for the mentally ill and humane treatment will cure the sick does not prove true. State mental hospitals become over-crowded, and custodial care supersedes humane treatment. New York World reporter Nellie Bly poses as a mentally ill person to become an inmate at an asylum. Her reports from inside result in more funding to improve conditions.