Analgenia is a rare disease characterized by the absence of pain - insensitivity to pain. "A" in clinical terminology indicates the absence of sensation of something (anesthesia). Pain and a feeling of cold are the only paresthesias that the body retains during analgenia. All other tactile and temperature sensations are absent. In this case, the term has an international meaning. And scientifically the disease is called analgoderma (disease of absence of pain).
The disease is caused by the cessation of the functioning of nociceptive nerve fibers. Painful impulse