High levels of CO₂ in the body and brain — a condition known as hypercapnia — can potentially trigger or exacerbate symptoms of ataxia, particularly if it affects the cerebellum or impairs neurological function.

The brain — especially the cerebellum (which coordinates movement and balance) — is extremely sensitive to changes in blood gases like CO₂ and O₂.

What CO₂ Does in the Brain

• Increases acidity (lowers pH of the cerebrospinal fluid)
• Causes cerebral vasodilation (increased blood flow), which can lead to increased intracranial pressure
• Impairs neuronal signaling and motor coordination
• Can produce symptoms like:
  • Dizziness
  • Confusion
  • Muscle weakness
  • Impaired coordination — i.e., ataxia