Source of Support: None, Conflict of Interest: None
The 'Headache' Classification of the International Headache Society (HIS) (1988) has been a major landmark document. It has helped to develop a common language for understanding headaches and to unify research in this field. It is useful in most situations but because it is complex and cumbersome, it is underutilised in practice. This article analyses the contributions, the limitations and outlines the proposed changes in the revised classification to be launched in 2003. It is hoped that more neurologists would start using this in their routine practice.