Thermography works by taking infrared pictures or spot measurements of heat variations in subsurfaces of the human body - not only to detect fever, but to draw temperature profiles of hidden internal inflammation (excess blood flow) or ischemia (lack of blood flow). Unlike X-rays of recording strictly anatomical damage like fractures or contorted intestines, thermography displays the abnormal heat patterns around irritated tissue which is reflected in sensory (dermatomes) or peripheral nerves so that physicians can follow the physiology of circulation and pain itself throughout the body - a crucial advantage when there are no fractures or lacerations. The technology eliminates much of the guesswork involved in the diagnosis and treatment of whiplash and all manner of soft-tissue injuries. Hence, it could benefit not only the one out of four adults who suffers at some time from often clinically vague back pain, but the millions more who are afflicted with once unprovable and unseeable aches from muscle spasms to migraine headaches.