Reye's Syndrome: Symptoms Worth Looking Out For

11. Unsteady Movements or Difficulty Walking

Loss of coordination is another serious neurological symptom that may emerge as Reye’s syndrome progresses. Children who were recently mobile may suddenly have difficulty standing, walking, or performing basic movements. This unsteadiness, known as ataxia, results from brain swelling affecting motor control. Parents might notice clumsiness, staggering, or even complete inability to walk. These signs are especially troubling when they appear after an initial recovery from a virus. Unlike normal tiredness or weakness, this level of impairment reflects central nervous system involvement. It’s urgent. Time matters—especially when movement becomes a visible warning sign.

12. Personality Changes or Unusual Behavior

In some cases, Reye’s syndrome alters a child’s demeanor so drastically that loved ones hardly recognize them. A once calm, cheerful child may become agitated, withdrawn, or completely disengaged. These personality shifts often stem from brain inflammation and toxic buildup in the bloodstream. Parents may notice inappropriate reactions, odd speech, or detachment from surroundings. Because this behavior emerges subtly, it’s often mistaken for moodiness or post-illness fatigue. But when these shifts appear suddenly and escalate alongside physical symptoms, they’re a red flag. Reye’s doesn’t just change chemistry—it distorts cognition and personality. That alone demands action.