Neurological
circa 5th–4th century BCE, ancient Greece (Hippocratic corpus — olfactory disturbance after head wounds)
The loss of the sense of smell, referred to historically by various descriptive terms before the word anosmia entered medical vocabulary, was documented by healers across multiple ancient civilizations. For much of recorded history, the condition was understood primarily as a symptom of head injury or nasal disease rather than as a distinct neurological phenomenon. The deeper anatomical and neurological understanding of olfactory loss developed gradually across centuries of anatomical investigation.
Historical Narrative
Ancient Mesopotamian and Egyptian healers were among the first to record observations about the nose's role in perceiving the world, and early texts hinted at cases in which smell was lost following head injuries or severe nasal disease. The Hippocratic corpus, compiled from roughly the fifth to fourth centuries BCE, referenced olfactory disturbances in the context of head wounds and noted that injuries to certain parts of the skull could abolish smell on one or both sides. This early clinical observation, embedded in trauma medicine, suggested an intuition about localization that would not be formally explained for many centuries.
Galen of Pergamon in the second century CE made significant contributions by describing the olfactory nerves anatomically, identifying what he termed the first pair of cranial nerves as the structures conveying the sense of smell from the nose to the brain. His dissections, performed primarily on animals, led him to argue that the porous, sieve-like bone at the base of the skull, later known as the cribriform plate of the ethmoid, allowed olfactory vapors to pass upward and communicate with the brain's ventricles. This vapor-based theory was speculative by later standards but represented a genuine attempt to link anatomy with function. Galenic teaching dominated European and Islamic medicine for over a thousand years, meaning that anosmia was interpreted within this framework as a failure of vaporous transmission.
Medieval Islamic physicians, including Ibn Sina and later Ibn al-Nafis, incorporated olfactory nerve anatomy into their comprehensive medical encyclopedias and recognized that head trauma, nasal polyps, and severe catarrhs could each disrupt smell in different ways. European medieval physicians, working largely from translated Arabic and Latin classical sources, largely echoed these frameworks, attributing olfactory loss to obstructions of the nose or to disturbances of the animal spirits passing through the cranial nerves.
The Renaissance brought renewed direct anatomical investigation. Andreas Vesalius, whose landmark atlas De Humani Corporis Fabrica appeared in 1543, corrected numerous Galenic errors and provided more accurate descriptions of the olfactory bulbs and tracts. Vesalius depicted the olfactory structures with greater precision than any predecessor, and his work encouraged subsequent anatomists to explore the relationship between these structures and the brain itself. Thomas Willis, the seventeenth-century English physician celebrated for his systematic neuroanatomy, described the olfactory nerves in his Cerebri Anatome of 1664 and noted that their disruption accounted for cases of lost smell following head injuries.
By the eighteenth and nineteenth centuries, clinicians began cataloguing anosmia more systematically as a phenomenon distinct from nasal obstruction alone, recognizing cases in which the nose appeared patent yet smell remained absent, pointing to a neural rather than mechanical origin. The German physician Johann Christian Hunold and later researchers investigated congenital absence of smell, and by the mid-nineteenth century the condition was being reported in association with certain developmental syndromes. The introduction of rigorous clinical neurology in the latter nineteenth century, championed by figures such as Jean-Martin Charcot in Paris, encouraged the systematic examination of all cranial nerve functions, placing olfactory testing within the standard neurological assessment for the first time and cementing anosmia's place as a discrete neurological finding.
Key Historical Figures
Historical narrative only — this page describes how Anosmia 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.