The effect of cumulative mild head injury (CMHI) in contact sports such as rugby union and football (soccer) is seen at all levels as more concussive injuries are reported each year globally and in South Africa. This is problematic as repeated concussions may lead to cognitive deficits in attention and poorer overall cognitive profiles both in the short and long term. The aim of this chapter is to present a brief review of research on CMHI in football and rugby and other sports (briefly) both international and South African underpinned by an overview of the anatomy and neuroanatomy of the brain to illustrate the mechanisms involved in head injuries. Risk factors for all types of MHI are also given.