Classification The ICHD classification and diagnosis of migraine distinguish 6 subtypes of<unk> . Familial<unk>  (FHM) can be loosely divided into two categories: with and without cerebellar signs. Cerebellar signs refer to ataxia, sometimes episodic and other times progressive, that can accompany FHM1 mutations and is caused by degeneration of the cerebellum. These cerebellar signs result in a phenotypic overlap between FHM and both episodic ataxia and spinocerebellar ataxia. This is unsurprising as subtypes of these disorders (FHM1, EA2 and SCA6) are allelic, i.e., they result from mutations in the same gene. The other forms of FHM seem to be distinguishable only on the basis of their genetic cause. Familial<unk>  Familial<unk>  is a form of<unk>  headache that runs in families. Sporadic<unk>  There are also non-familial cases of<unk> , termed sporadic<unk> . These cases seem to have the same causes as the familial cases and represent de novo mutations. Sporadic cases are also clinically identical to familial cases with the exception of a lack of family history of attacks.
Hemiplegic migraine
Acephalgic migraine
Mixed tension migraine
External compression headache
Cluster headache
Sporadic hemiplegic migraine
Thunderclap headache
Familial hemiplegic migraine