=11pt the heart panics, the sweat glands produce too much sweat, transit accelerates, etc. Suddenly, "you lose weight even when you eat more than usual," says Dr. Nys. An indicator of cancer One of the first symptoms of cancer is sudden weight loss . In fact, 4 out of ten people diagnosed report significant weight loss in the previous months. A British study, from the University of Oxford, moreover proved in April 2018 this frequent link. By compiling medical data from 11.5 million patients.