Physical and moral violence against the workers of a local public health unit is perspectively studied in the period 2005-2011. Data were collected during periodic medical surveillance of all workers exposed to risk and with more than one year of seniority. The prevalence of the phenomenon is constant in the period under review. On average, each year a worker in ten is physically assaulted, and one in five is subjected to verbal abuse. The professional groups most exposed to violence are nurses (OR 2.67 IC95% 1.63-4.39) and doctors (OR 2.44 IC95% 1.34-4.46). The areas at greatest risk are the psychiatric care (OR 25.7, IC95% 11.1-59.6) and emergency and first aid (OR 8.8, CI95% 3.8-20.5). The workplace violence against health workers requires urgent preventive interventions.