Nodding disease

Nodding disease is a childhood-onset neurological disorder marked by recurring head-nodding seizures, reported mainly in parts of East Africa. Its cause remains uncertain, with epidemiological evidence linking it to onchocerciasis.

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Epileptic seizure: A temporary episode of abnormal, excessive or synchronous neuronal activity in the brain. Nodding episodes are seizure events, often accompanied by impaired awareness.
Nakalanga syndrome: A childhood disorder reported in East Africa, featuring stunted growth, delayed puberty, and neurological problems. Its features overlap with severe or later presentations described in nodding disease.
Louise Jilek-Aall: A Norwegian physician and psychiatrist who conducted early research on epilepsy in Tanzania. Her work helped document head-nodding seizures in the Mahenge region.
Electroencephalography: A method that records electrical activity in the brain using electrodes placed on the scalp. EEG can identify seizure patterns and guide evaluation of head-nodding episodes.
Epilepsy: A neurological disorder characterized by an enduring predisposition to recurrent unprovoked seizures. Its classification determines how nodding disease is distinguished from other seizure disorders.
Atonic seizure: A seizure involving a sudden loss of muscle tone, sometimes causing a head drop or fall. Sudden loss of neck tone can resemble the characteristic head nods.
Nodding syndrome in South Sudan: An epidemic of childhood-onset nodding seizures documented in South Sudan, especially in the Mundri area. South Sudanese cases helped establish the syndrome’s clinical and public-health profile.
Onchocerciasis-associated epilepsy: A proposed spectrum of epilepsy associated epidemiologically with Onchocerca volvulus infection in endemic areas. It places nodding disease within a broader pattern of epilepsy linked to river blindness.
Magnetic resonance imaging: A medical imaging technique that uses magnetic fields and radio waves to produce detailed body images. MRI helps assess structural brain abnormalities in affected children.
Prion disease: A group of fatal neurodegenerative disorders caused by misfolded proteins that propagate their abnormal shape. A prion-like hypothesis has been proposed but lacks convincing confirmation.