Acute illness: an illness with a defined beginning and end, episodic in nature, like chicken pox and common cold. Chronic condition: a condition that doesn"t go away or get better, can be serious, life-threatening, and are often accompanied by severe symptoms, emotional distress due to consistent nature, type 2 diabetes, cancer. Is not one disease, but many: the experience of a patient with one form of cancer can differ radically from that of another patient with a different form. Oncology: the study and treatment of cancer, oncologists often specialize in a particular site where cancer occurs in the body, specialization is a further indication of the differences between types of cancer, or sites of cancer. Sites of cancer: types of cancer as defined by the location of the tumour. Metastasized: frequently used to denote the spread of cancer. As of 2012: an estimated 186,400* cases of cancer (see notes section, an estimated 75,700 cancer related deaths.