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Congenital insensitivity to pain (CIP), also known as congenital analgesia, is one or more extraordinarily rare conditions in which a person cannot feel (and has never felt) physical pain. [1] The conditions described here are separate from the HSAN group of disorders, which have more specific signs and cause.
Marsili syndrome is an extremely rare genetic disorder which is characterized by symptoms similar to those reported on individuals with congenital insensitivity to pain with anhidrosis. It can be fatal if it goes unnoticed/undiagnosed.
The first sign of HSAN2 is usually numbness in the hands and feet. Soon after, affected individuals lose the ability to feel pain or sense hot and cold. People with HSAN2 often develop open sores (ulcers) on their hands and feet. Because affected individuals cannot feel the pain of these sores, they may not seek treatment right away.
Since people with this condition are unable to sweat, they are unable to properly regulate their body temperature. [1] Those affected are unable to feel pain and temperature. [2] [3] The absence of pain experienced by people with CIPA puts them at high risk for accidental self-injury. Corneal ulceration occurs due to a lack of protective ...
Complex regional pain syndrome is characterized by pain that is distributed regionally, usually starts in an extremity distally, occurs after a trauma, and is disproportionate in severity or duration compared to the expected course of the trauma — the sites affected by complex regional pain syndrome experience autonomic and inflammatory changes.
As the disease progresses, patients sometimes become unable to walk or bend. [8] Chronic pain is common and worsens over time, but sometimes acute pain occurs as well. [9] Stress, cold weather, and infections lead to an increase in symptoms, and sleep decreases them. [7]
Complex regional pain syndrome (CRPS type 1 and type 2), sometimes referred to by the hyponyms reflex sympathetic dystrophy (RSD) or reflex neurovascular dystrophy (RND), is a rare and severe form of neuroinflammatory and dysautonomic disorder causing chronic pain, neurovascular, and neuropathic symptoms.
Pain conditions are generally considered "acute" if they last less than six months, and "chronic" if they last six or more months. [4] The neurological or physiological basis for chronic pain disorders is currently unknown; they are not explained by, for example, clinically obtainable evidence of disease or of damage to the painful areas.