Nairobi County has been faced with different health challenges pertaining diseases such as TB, HIV/AIDS, maternal health among others. The data was acquired from DHIS1 which is a health report of the county from years 2013- 2017. Information gathered from health information system is important for monitoring health and improving the delivery of health care.[1]. The aim was to understand the trend of diseases affecting the people from the county over the years and causes of the trend. R was used to analyze the data and the results were presented in visuals then discussed.