Acute cerebellar ataxia is sudden onset of uncoordinated muscle movement.

Acute cerebellar ataxia is most common in children, especially those younger than age 3. It often occurs several weeks after a viral illness.

Viral infections that may cause this include chickenpox, Coxsackie disease, Epstein-Barr, and mycoplasma pneumonia.

Exposure to older insecticides called organophosphates or other toxins may also cause ataxia.

Ataxia may affect movement of the middle part of the body from the neck to the hip area (the trunk) or the arms and legs (limbs).

When the person is sitting, the body may move side-to-side, back-to-front, or both, and quickly move back to an upright position.

When a person with ataxia of the arms reaches for an object, their hand may sway back and forth.

Common symptoms of ataxia are listed below.

• Sudden, uncoordinated movement
• Walking problems (unsteady gait)
• Sudden (nystagmus) or uncoordinated eye movements
• Clumsy speech pattern (dysarthria)

The doctor will ask you if you have been recently sick, and try to rule out any other causes for the problem. . A full neurological examination will be done to identify the areas of the nervous system most affected.

The following tests may be done:

• Spinal tap
• CT or MRI scan of the head

Ataxia may go away without treatment after a few weeks to months. However, physical therapy may be helpful in improving coordination.

Full recovery usually occurs without treatment within a few months.

Movement or behavioral disorders may (rarely) persist.

Call your health care provider if any symptoms of ataxia appear.

Johnston M. Movement disorders. In: Kliegman R, Behrman R, Jenson H, Stanton B, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 597.

Timmann D, Diener H. Coordination and ataxia. In: Goetz, CG, ed. Textbook of Clinical Neurology. 3rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 17.