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Non-opioid treatment of chronic pain with pharmaceutical medicines might include acetaminophen (paracetamol) [45] or NSAIDs. [46] Various other nonopioid medicines can be used, depending on whether the pain is a result of tissue damage or is neuropathic (pain caused by a damaged or dysfunctional nervous system).
[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.
[58] [59] In the treatment of chronic pain, the three-step WHO Analgesic Ladder provides guidelines for selecting the appropriate medicine. The exact medications recommended will vary by country and the individual treatment center, but the following gives an example of the WHO approach to treating chronic pain with medications.
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]
Low-dose naltrexone has been studied for the treatment of multiple chronic pain disorders including fibromyalgia, multiple sclerosis, Crohn’s disease, and complex regional pain syndrome. [2] Naltrexone is approved by the Food and Drug Administration (FDA) for medication-assisted treatment of alcoholism and opioid use disorders. [3]
The treatment of LPHS varies considerably from centre to centre. As the condition is rare and poorly understood, a widely adopted standard of care is not existent. [citation needed] Treatment of loin pain-hematuria syndrome (LPHS) typically consists of pain management. Narcotics or oral opioids may be prescribed to help control pain.
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.
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.