Infrared thermography examination principle is to use the human body infrared radiation to convert heat energy into electrical signals, scanning imaging, infrared thermography is an instrument to measure the temperature distribution state of the human body surface, can reveal the human body temperature distribution and its change pattern, so as to make an effective diagnosis of disease. The human body is a natural organism, infrared radiation source belongs to the constant temperature animal, can maintain a certain body temperature, when the human body suffers from disease or in some physiological condition changes, the whole body or local heat balance will be disrupted, clinically will be manifested as a rise or decrease in tissue temperature, infrared thermography examination is through the discovery of body surface temperature changes to achieve the purpose of diagnosing disease. It is recommended that patients suffering from the disease should go to a regular hospital for relevant examination, the doctor will use relevant instruments to determine the disease according to the specific situation, only the disease diagnosed by the instrument is the most accurate, purely based on the symptoms of speculation is a certain error.