[Violence against women and family medicine]. 
prevalence of violence against women in Mexico fluctuate within 30 to 60%, but health and court administration institutions' numbers are under real ones, they only include extreme violence or pressed charges against them aggressor.  To asses the level of knowledge on the norms and procedures for the attention of domestic violence in family practitioners workers of the Instituto Mexicano del Seguro Social in Colima, México.  A cross-sectional study was conducted during the September-December 2005 period.  The indicator was obtained of a self-administered questionnaire.  The data collection instrument was design to asses the level of knowledge in five areas: definition, norms, classification, risk factors and domestic violence indicators.  An knowledge index was constructed and analyzed using frequencies distribution and percentages.  The age average was 41 years; medical practice 20 years.  72% men, 28% women; 91% had sentimental couple; 53% was family medicine specialist and 2% mastery; 53% worked in the morning shift and 47% in the evening one.  The 91% didn't know the Mexican official norm; 91% without training on domestic violence, 74% ignored the types that exist; 76% ignored the cycles; 63% didn't register it as diagnostic in the clinical file; 52% know that the integral attention health registration leaf has a specific item for this problem.  The average of guessed right answers was of 19 (range 15-24).  The level of knowledge on the norms and procedures for the attention of domestic violence in family practitioners workers of the Instituto Mexicano del Seguro Social in Colima, México; was low degree in 0%, moderate in 81% and highly in 19%.