Prior to tumor formation, cells in the breast(s) beging to create a cancer-friendly environment. Part of this process involves anggiogenesis or the development of new blood vessels. These blood vessels provide significant blood supply to the area which allows the abnormal cells to multiply. The process of angiogenesis creates significant heat or thermal patterns. Thermography, being sensitive to fluctuations in temperature can visualize these changes in the breast and give an early warning signal.