epilepsy

Around 400 BCE, Hippocrates of Kos wrote a treatise called 'On the Sacred Disease,' and his argument was that epilepsy was not sacred at all. The Greeks of his time attributed seizures to divine punishment or demonic possession, naming the condition from 'epilambanein': to seize, to take hold of, the same verb used for a god gripping a person. Hippocrates insisted the condition had a physical cause in the brain. His treatise was the first sustained argument that a disease could be neurological rather than theological.

The word 'epilēpsia' moved from Greek medical texts into Latin directly, with no change of meaning and almost no change of form. Galen of Pergamon, writing in the 2nd century CE, described three types based on where in the brain the disturbance originated, extending Hippocrates's framework. Roman physicians also used the term 'morbus comitialis,' the assembly disease, because a seizure during a public meeting was taken as a divine omen requiring the gathering to disband. Both names coexisted for centuries, with very different connotations.

Islamic physicians translated the Greek corpus in Baghdad in the 9th century, and Ibn Sina devoted sections of his 'Canon of Medicine' to the condition he called 'sara' in Arabic while preserving the Greek term in scholarly contexts. The learned tradition consistently treated epilepsy as a brain disease, even when folk medicine still attributed seizures to spirits. The medical schools of Salerno and Paris returned the Greek-Latin term to Western European medicine through these Arabic translations.

The 19th-century neurologist John Hughlings Jackson, working at Queen Square in London in the 1870s, gave the modern understanding its architecture: a seizure is abnormal electrical discharge propagating through the brain. His observations were precise enough that the 'Jacksonian march,' the spread of motor symptoms outward from one point, still carries his name. The word Hippocrates chose 2,400 years ago proved accurate in a way he could not have known: epilepsy is, in every measurable sense, the brain seizing upon itself.