Objective: To devise and test the reliability and validity of a brief headache diary in a series of Colombian patients with chronic daily headache. Methods: The study was designed in five stages: selection of domains (group of patients and experts); initial devising of the items (writing group); identification of non-understandable items (n=20); assessment of internal consistency (n=100); assessment of validity and assessment of sensitivity to change during seven consecutive days (n=25, 175 observations). Results: Five domains were selected: headache presence, severity and length of pain, analgesics intake, and missing workdays. The headache diary is internally consistent (≈75% of rotated variance), correlates with the medical interview (Spearman's rho and Kendall's tau over 0.8 for each domain) and it has an adequate and stable sensitivity and specificity (82 to 96%). Conclusions: This headache diary is a reliable and valid instrument and represents the most important features affecting Colombian patients with chronic daily headache.Key words: Colombia, diagnosis, headache disorders, medical records, reproducibility of results, validation studies. resumenObjetivo: Diseñar y testar la validez y reproducibilidad de un diario de cefalea en una serie de pacientes Colombianos con cefalea crónica diaria. Métodos: El estudio fue diseñado en cinco fases: selección de los dominios (grupo de pacientes y expertos); diseño inicial de los ítems (grupo redactor); identificación de ítems no comprensibles (n=20); determinación de la consistencia interna (n=100); determinación de la validez y la sensibilidad al cambio durante siete días consecutivos (n=25, 175 observaciones). Resultados: Fueron seleccionados cinco dominios: presencia, severidad y duración del dolor, ingesta de analgésicos y días laborales perdidos. El diario tiene una adecuada consistencia interna (≈75% de la varianza), se correlaciona con la entrevista médica (rho de Spearman y tau de Kendall >0.8 para cada dominio) y tiene sensibilidad y especificidad estables y satisfactorias (82 a 96%). Conclusiones: Este diario de cefalea es un instrumento confiable y registra las principales características de las cefaleas en pacientes con cefalea crónica diaria.Palabras-Clave: Colombia, diagnóstico, cefalea, registros médicos, reproducibilidad de resultados, estudios de validación.controls 5,6 . Several factors might affect the internal validity of studies in CDH patients, among them the lack of reliable measurement instruments.Lipton et al. defined CDH as headaches that occur for ≥4 hours a day on ≥15 days a month over three months 7 . In the next decade,
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