Objective: To identify the most common diseases, according the workplace. Material and Methods: The research was descriptive, prospective, exploratory and cross-sectional. It was made at a factory in Lima, which was in the process of application to the law Safety and Health at Work. According to the selection criteria, 121 workers were admitted, which took part of the medical examination, and a file card for medical occupational data was applied. The descriptive statistical analysis (mean, standard deviation, and respective frequencies of 95 %) was performed and a level of significance (p<0.05). The statistical package SPSS and Microsoft Excel were used. Results: The population of study was divided into two occupational areas: workers and administrative staff. The average age was 37.48 years and males represented 83.5%. The most frequent pathological characteristics were: Dyslipidemia...