Experienced through deepening inter-clan conflict, food insecurity, poverty, educational and health crisis, proliferation of small arms and light weapons, violent extremism and radicalization among others; human insecurity has heightened in North Eastern Kenya in recent decades. While this fact is widely acknowledged there has been little discussion on underlying factors which cause human insecurity in the region. The main objectives of this study were to establish sources of human insecurity in North Eastern Kenya, establish the extent of human insecurity and finally its impact in Kenya. To achieve these objectives, the study relied on empirical data, oral interview and data collected through structured questionnaires. The study administered 100 questionnaires to randomly selected community members. The interview part covered 15 community members. The data from questionnaire was processed by use of statistical package for social sciences (SPSS). The study found that deployment of Kenya defense forces in Somalia, geographical proximity of Kenya to Somalia, food insecurity, abject poverty, historical marginalization of the region, corruption, as well as radicalization and violent extremism are among major causes of human insecurity in North Eastern Kenya. The study found that to a great extent human insecurity is a serious problem in the region. Furthermore human insecurity in North Eastern Kenya has spillover effect to other parts of the country. Finally the study concludes that factors causing human insecurity in North Eastern Kenya are interconnected in such a way one leads to the other for instance inter-clan conflict has created ready market for guns.