Equine headshaking is a painful neurological condition causing involuntary head movement and facial discomfort. Diagnosis and management have improved substantially in recent years.
Headshaking causes genuine, often severe suffering — the trigeminal neuralgia that drives most cases produces sensations comparable to spontaneous severe facial pain in humans, often triggered by light, wind, or exercise. Horses in acute photic headshaking episodes show clear behavioral indicators of distress and are unable to work or engage normally with their environment. The condition is frequently misunderstood as behavioral, leading to inappropriate correction that worsens welfare further. Correct diagnosis followed by a trial of appropriate treatment significantly improves outcomes for most affected horses.