Symptoms of disease are highly changeable, if not unpredictable. The causes of disease remain obscure to most medical practitioners and their patients. A stomach catarrh, or inflammation of the mucous membrane, for example, may initially show up as an irritation and then become an ulcer. Next it may be perceived as a hardening of tissue and, eventually, be diagnosed as cancer. The course and intensification of pathological symptoms (signs of disease) may vary from person to […]