The Intergovernmental Panel for Climate Change (IPCC) in its third assessment report (TAR) on climate change has forecast that global warming will have a major impact on health conditions. TAR predicts the morbidity and mortality rate in society and vector-borne diseases caused by climate change. The rise in temperature due to global warming will directly affect human health in the form of heat stress and also indirectly through various vectors and pathogens. The study of heatstroke and excessive death due to heat stress among the elderly suggests that summer heat will affect greater numbers of people more frequently because of global warming. It has been reported that during intense summer heat when temperatures rise above a threshold value, heat related diseases increased noticeably. In order to evaluate the effects of global warming on health conditions, it is necessary to gather data on the health of the subjects in question, their susceptibility to disease, and threshold temperatures.