Thomas Sydenham

Thomas Sydenham: The Physician Who Trusted the Bedside

"Physick is not to bee learned by going to Universities," wrote a Dorset man who had fought in the Civil War before he ever fought the medical establishment. Thomas Sydenham held no fellowship of the Royal College of Physicians, occupied no university chair, and took his M.D. at the age of fifty-two, decades after his London practice had made him famous. He is nonetheless the figure from whom modern clinical medicine is usually dated — "the egg," in one memorable formulation, "from which subsequent clinical medicine was hatched."

Soldier First

Sydenham was born in 1624 at Wynford Eagle in Dorset. He entered Magdalen Hall, Oxford, and then left it: the English Civil War broke out and he served in the parliamentary army, an experience that cost him years and probably shaped the impatience with received authority that marks everything he later wrote. He returned and took his bachelor of medicine in 1648. The M.D. did not follow until 1676, from Cambridge, by which point he had been practising in Westminster for some fifteen years and had already published the book that made his name.

The gap between those two dates is the man. He was not credentialled into eminence; he arrived at it sideways, from a consulting room, and the medical establishment never entirely forgave him. Among those who did recognise what he was doing were two of the most formidable minds in England: the chemist Robert Boyle and the philosopher John Locke, who had trained in medicine himself and who worked closely enough with Sydenham that the two men's ideas about how knowledge is acquired are difficult to separate.

Against Theory

Seventeenth-century medicine was theory-saturated. Physicians reasoned downward from humours, from Galen, from chemical or mechanical systems, and treated the patient as an instance of a doctrine. Sydenham refused the whole procedure. He held that the physician's business was to observe what a disease actually does — its onset, its course, its signs, its season, its ending — and to record that with the fidelity of a naturalist describing a species. Hidden causes were not merely unknown but, in his view, not the doctor's proper object; he declined even to pursue anatomical investigation, on grounds that were partly religious, holding that a physician should attend to what the sick body presents rather than speculate about mechanisms God had not made visible.

This was, on its face, a retreat. In practice it was the beginning of nosology — the classification of diseases as distinct entities with their own natural histories rather than as variable expressions of a single underlying imbalance. It is the conceptual move that makes diagnosis possible at all.

The clinical payoff was immediate and large. He separated scarlet fever from measles, which had been confounded, and gave the first clear description of it. In 1679 he named whooping cough *pertussis*. He described the involuntary jerking movement disorder of childhood that still bears his name — Sydenham's chorea, the old St Vitus's dance. He introduced laudanum, the tincture of opium, into settled medical use, and he championed Peruvian bark, the source of quinine, against malarial fevers, at a time when its foreign and Jesuit associations made it suspect in Protestant England.

Gout, From the Inside

His account of gout is the most celebrated case study he wrote, and he had the qualification of the sufferer: he had the disease himself for decades and observed it on his own body with the same detachment he brought to a patient's. The description of the night-time onset in the great toe, the mounting agony, the intolerance of the weight of a bedsheet, remains quoted in rheumatology texts. It also killed him, by way of the kidneys.

Doing Nothing

Sydenham's therapeutics were conservative to a degree that unnerved his contemporaries. In an age of aggressive purging, bleeding, blistering and dosing, he favoured expectancy — watching the illness run its natural course and intervening only where intervention had a demonstrable point. "I have consulted my patients' safety," he wrote, "most effectually by doing nothing at all." Given the seventeenth-century pharmacopoeia, this was not laziness but arithmetic: most of what a doctor could do to a patient made things worse, and knowing when to withhold treatment was the most reliable clinical skill available.

Why Thomas Is Called a Genius

Sydenham's quality was epistemic self-restraint, which is an odd sort of genius and a genuinely rare one. He was not a great discoverer; almost nothing in his work required an experiment, an instrument or a mathematical insight. What he did was reorganise the relationship between a physician and the evidence in front of him. He decided that a disease should be described the way a botanist describes a plant — patiently, repeatedly, without theory — and that a treatment should be judged by what happened to the patient rather than by whether it followed from a system. Both propositions look obvious now precisely because he won.

The counter-case is substantial and should not be softened. His refusal of anatomy and of the search for hidden causes was a real intellectual limitation, and the century that followed him proved it: the pathological anatomists of Paris and Vienna made their advances by doing exactly what he said should not be done. He rejected humoral theory in favour of observation but replaced it with no positive account of what disease is. He was in some respects a reactionary, resisting the microscopic and experimental currents already running through the Royal Society his friend Boyle helped lead. And the title "the English Hippocrates" was largely conferred after his death, by later physicians who needed a founder; his own contemporaries were considerably cooler. A fair verdict is that his greatness lies in a discipline of attention rather than in any single thing he found out — which is also the reason it transferred so easily to everyone who came after him.

Legacy

*Observationes Medicae*, published in 1676, remained a standard medical text for something close to two centuries — an extraordinary run for a book that contains almost no theory. He died on 29 December 1689 of renal failure from the gout he had spent his life describing. A learned society was founded in his name, and his statue stands at Oxford, the university whose methods he did not much rate. Every time a doctor writes down what a patient actually has rather than what the textbook says they should have, the debt is being paid.

Achievements

• Fields: medicine