Department of Neurology

Pediatric Motor Disorders Research Program

Alternating Hemiplegia of Childhood

What is Alternating Hemiplegia? 

Alternating Hemiplegia of Childhood (AHC) is a rare neurological disorder in which repeated, temporary attacks of paralysis occur, affecting one side of the body or the other, or even both sides at once.  Complete paralysis of one side of the body is known as hemiplegia, and paralysis of both sides at the same time is known as quadriplegia.

Attacks may range from mild weakness to full paralysis, and may last for minutes, hours or even days. Typically attacks alternate from one side of the body to the other, but it is not uncommon for one side to be more frequently affected, or for episodes to begin on one side, and then switch to the other.