Diabetes mellitus (DM) is a chronic and potentially disabling disease. It is a major and growing threat to global public health. The prevalence of diabetes and its adverse health effects have risen more rapidly in India and Pakistan. In Pakistan, majority of people live on or below the poverty line and having lack of access to healthcare services, lack of national welfare schemes and provision of health insurance for the poor population. In this article, different types of diabetes, risk factors and associated complication have been studied.