Episodic ataxia is characterised as bouts or attacks of ataxia symptoms. The episodic ataxias are a relatively rare group of conditions which, as their name suggests, tend to affect people in bouts or attacks of unsteadiness. There are several types, but type 2 are the most well understood, and they are called episodic ataxia type 1 and 2. Both of these occur in families and are inherited in what is known as an autosomal dominant manner. This means that an affected individual has a 50% chance of passing the gene on to their children.

You can read more about the episodic ataxias here.