The "IHS" Classification (1988, 2004)--contributions, limitations and suggestions.

The first 'International Classification of Headache Disorders' by The International Headache Society (1988) was a major landmark document. It helped develop a common language for understanding headaches and advanced research in this neglected field. It was found to be useful, but because it was complex and cumbersome, it remained underutilised in practice. An evidence-based revised second edition was launched in 2004. This article analyses the Contributions and Limitations of this Classification. The important changes that pertain to 'Migraine' in the revised 2004 Classification have been listed. It is hoped that this Classification will be used more often in practice not only by Neurologists but by all who see headache patients in their routine practice.