Nutritional
c. 5th–4th century BCE, ancient Greece (Hippocratic Corpus references to childhood skeletal deformities consistent with rickets)
Rickets, a condition of skeletal softening and deformity that left unmistakable traces in skeletal remains and historical art, afflicted children across many civilizations and attracted the attention of physicians long before its nutritional and environmental causes were understood. For most of medical history, physicians attributed it to constitutional weakness, cold climates, poor nursing practices, or inherited flaws, with no understanding of vitamin D or its relationship to sunlight and diet. The unraveling of rickets' true cause across the late nineteenth and early twentieth centuries represented one of the landmark achievements of nutritional science.
Historical Narrative
Archaeological evidence suggests that rickets predated written medicine by millennia, with skeletal remains showing characteristic bowing of the long bones and other deformities recovered from ancient burial sites across Europe and the Near East. Hippocratic writings of the fifth and fourth centuries BCE mentioned skeletal deformities in children in terms consistent with what later observers would identify as rickets, attributing such conditions to excess moisture, poor maternal constitution, and the damp climates of certain regions. Greek physicians believed the soft bones of affected children reflected an overabundance of phlegm obstructing normal developmental processes.
Galen elaborated on these ideas in the second century CE, proposing that soft and deformed bones in young children resulted from constitutional imbalances affecting the growing body's capacity to solidify properly. His explanations dominated medical thinking about childhood skeletal disease for well over a thousand years. Medieval Islamic physicians, including Ibn Sina (Avicenna), documented rachitic deformities and offered similar humoral explanations, while also noting the greater frequency of the condition in cold and damp northern environments — an observation that would later take on new significance.
The seventeenth century produced the first sustained Western medical attention to rickets as a recognizable clinical entity. Francis Glisson, a Cambridge physician, published De Rachitide in 1650, widely regarded as the first systematic treatise on rickets in the European medical tradition. Glisson described the condition in careful anatomical and clinical detail, gave it the name 'rickets' (though the etymology of the word remains debated, with some historians linking it to the Old English 'wrickken,' meaning to twist), and attributed its cause to a defect in nourishment reaching the bones from the blood. Glisson's work was collaborative — Daniel Whistler and George Bate contributed observations — and it remained the authoritative text on rickets for generations, even though it offered no correct causal explanation.
Through the eighteenth and nineteenth centuries, rickets became increasingly associated with urban poverty, industrialization, and the crowded, sunless conditions of growing industrial cities. Physicians and public health reformers in Britain, France, and Germany observed that working-class children in smoky industrial towns suffered far higher rates of rachitic deformity than their rural counterparts, though the mechanism remained elusive. Some physicians suspected diet, others blamed lack of fresh air, and still others returned to hereditary explanations.
The decisive scientific breakthrough came in stages across the late nineteenth and early twentieth centuries. In 1890, the Scottish physician Theobald Palm conducted a systematic global survey of rickets' geographic distribution and proposed, based on his correspondence with medical missionaries worldwide, that sunlight exposure was the key protective factor. Palm's hypothesis was largely ignored at the time. Experimental work accelerated in the early twentieth century: Elmer McCollum and Marguerite Davis identified fat-soluble vitamins around 1913-1914 in their dietary experiments, and Edward Mellanby produced rickets experimentally in dogs through dietary manipulation between 1918 and 1921, demonstrating conclusively that a nutritional factor was responsible. McCollum subsequently identified the specific substance as vitamin D in 1922. Alfred Hess and Lester Unger simultaneously demonstrated that ultraviolet light could cure rickets, reconciling the sunlight and dietary hypotheses by revealing that the body produced vitamin D through sun exposure. These converging lines of evidence transformed rickets from a disease of mysterious origin into the first major nutritional deficiency condition to be fully explained at a biochemical level.
Key Historical Figures
Historical narrative only — this page describes how Rickets was understood historically. It is not medical advice and does not describe current diagnosis or treatment. Sourced from verified medical history references (NIH, Encyclopaedia Britannica, and standard medical history texts). See our medical disclaimer.