The first part of the article presents the physical basis of infrared thermography and thermal imaging cameras (detectors) using the detection of infrared radiation, enabling the detection of temperature changes in various parts of the human body, thanks to which infrared thermography is used in complementary diagnostics of diseases in many fields of medicine: angiology, internal diseases, aesthetic and reconstructive surgery (as described in the first part of the article), as well as in gynecology and obstetrics, cardiology and heart surgery, oncology, orthopedics, pediatrics, rheumatology, dentistry and urology (as described in this, second part of the article). Infrared thermography is a promising complementary diagnostic method. Infrared thermography has both advantages (non-invasiveness, high-speed of execution, ability to generate images of the entire body, simultaneous detection of a host of health problems and diagnosis at the subclinical stage), as well as disadvantages (sensitivity of the measurement to the external factors: changes in ambient temperature, humidity and air movement) which should be kept in mind when applying this diagnostic method.