How Does Extreme Heat Kill You? Currently, there is a heat wave in India that has killed thousands. What makes heat so deadly, and why can’t the body fight back? Read More:India Heat Wave, Now 5th Deadliest on Record, Kills More Than 2,300 About 1,100 People Dead as Summer Temperatures Soar in India What Causes A Heat Wave? How the Human Body Cooks to Death By: DNews.