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[3] [4] Chronic pain is considered a syndrome because of the associated symptoms that develop in those experiencing this disorder. [5] Chronic pain affects approximately 20% of people worldwide and accounts for 15–20% of visits to a physician. [3] Pain can be categorized according to its location, cause, or the anatomical system which it affects.
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.
Central pain syndrome, also known as central neuropathic pain, [1] is a neurological condition consisting of constant moderate to severe pain due to damage to the central nervous system (CNS) which causes a sensitization of the pain system. [2] [3] The extent of pain and the areas affected are related to the cause of the injury. [4]
The International Association for the Study of Pain (IASP) defines chronic pain as a general pain without biological value that sometimes continues even after the healing of the affected area; [8] [9] a type of pain that cannot be classified as acute pain [b] and lasts longer than expected to heal, or typically, pain that has been experienced on most days or daily for the past six months, is ...
Nociplastic pain is a longterm complex pain, one of three mechanisms of pain, defined by the International Association for the Study of Pain as "pain that arises from altered nociception despite no clear evidence of actual or threatened tissue damage causing the activation of peripheral nociceptors or evidence for disease or lesion of the somatosensory system causing the pain". [2]
The syndromes within CAPS overlap clinically, and patients may have features of more than one disorder. In a retrospective cohort of 136 CAPS patients with systemic involvement from 16 countries, [2] the most prevalent clinical features were fever (84% of cases, often with concurrent constitutional symptoms such as fatigue, malaise, mood disorders or failure to thrive), skin rash (either ...
This type of familial episodic pain syndrome is characterized by childhood-onset intense episodic pain on the lower and sometimes upper extremities, this pain typically lasts days and can be treated with anti-inflammatory medication, the pain episodes tend to lower in severity with age. It is caused by mutations in the SCN11A gene, in chromosome 3.
Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) is characterized by pelvic or perineal pain without evidence of urinary tract infection, [8] lasting longer than 3 months, [9] as the key symptom. Symptoms may wax and wane. Pain can range from mild to debilitating. Pain may radiate to the back and rectum, making sitting uncomfortable.