'Ataxia' means ‘absence of order’. People with ataxia have problems of co-ordination. This is because parts of the nervous system that normally control co-ordination and balance are affected. Ataxia is the principal symptom of a group of neurological disorders called the cerebellar ataxias. Most are progressive. (text taken from Ataxia Uk website, www.ataxia.org.uk)

Episodic ataxia is one type of ataxia among
a group of inherited diseases of the central
nervous system. Episodic ataxia is the result
of genetic defects that lead to impairment of
specific nerve fibers that carry messages to and
from the brain to control movement of the body.
Episodic ataxia includes:
n episodic ataxia type 1 (EA1)
n episodic ataxia type 2 (EA2)
n episodic ataxia with paroxysmal
choreoathetosis and spasticity
There are now six recognized episodic ataxia
syndromes, numbered 1-6. The genes are
known for EA1, EA2, EA5, and EA6. The best
characterized are EA 1 and EA2, the others are
exceptionally rare. (Text taken from National Ataxia Foundation, www.ataxia.org)