Nociceptive Mechanism of nociceptive<unk> . Nociceptive<unk>  is caused by stimulation of sensory nerve fibers that respond to stimuli approaching or exceeding harmful intensity (nociceptors), and may be classified according to the mode of noxious stimulation. The most common categories are "thermal" (e.g. heat or cold), "mechanical" (e.g. crushing, tearing, shearing, etc.) and "chemical" (e.g. iodine in a cut or chemicals released during inflammation). Some nociceptors respond to more than one of these modalities and are consequently designated polymodal. Nociceptive<unk>  may also be classed according to the site of origin and divided into "visceral", "deep somatic" and "superficial somatic"<unk> . Visceral structures (e.g., the heart, liver and intestines) are highly sensitive to stretch, ischemia and inflammation, but relatively insensitive to other stimuli that normally evoke<unk>  in other structures, such as burning and cutting. Visceral<unk>  is diffuse, difficult to locate and often referred to a distant, usually superficial, structure. It may be accompanied by nausea and vomiting and may be described as sickening, deep, squeezing, and dull. Deep somatic<unk>  is initiated by stimulation of nociceptors in ligaments, tendons, bones, blood vessels, fasciae and muscles, and is dull, aching, poorly-localized<unk> . Examples include sprains and broken bones. Superficial somatic<unk>  is initiated by activation of nociceptors in the skin or other superficial tissue, and is sharp, well-defined and clearly located. Examples of injuries that produce superficial somatic<unk>  include minor wounds and minor (first degree) burns. Neuropathic Neuropathic<unk>  is caused by damage or disease affecting any part of the nervous system involved in bodily feelings (the somatosensory system). Neuropathic<unk>  may be divided into peripheral, central, or mixed (peripheral and central) neuropathic<unk> . Peripheral neuropathic<unk>  is often described as "burning", "tingling", "electrical", "stabbing", or "pins and needles". Bumping the "funny bone" elicits acute peripheral neuropathic<unk> . Some manifestations of neuropathic<unk>  include: traumatic neuropathy, tic douloureux,<unk> ful diabetic neuropathy, and postherpetic neuralgia. Nociplastic Nociplastic<unk>  is<unk>  characterized by a changed nociception (but without evidence of real or threatened tissue damage, or without disease or damage in the somatosensory system). In some debates regarding physician-assisted suicide or euthanasia,<unk>  has been used as an argument to permit people who are terminally ill to end their lives. This applies, for example, to fibromyalgia patients. Psychogenic Psychogenic<unk> , also called psychalgia or somatoform<unk> , is<unk>  caused, increased or prolonged by mental, emotional or behavioral factors. Headache, back<unk>  and stomach<unk>  are sometimes diagnosed as psychogenic. Sufferers are often stigmatized, because both medical professionals and the general public tend to think that<unk>  from a psychological source is not "real". However, specialists consider that it is no less actual or hurtful than<unk>  from any other source. People with long-term<unk>  frequently display psychological disturbance, with elevated scores on the Minnesota Multiphasic Personality Inventory scales of hysteria, depression and hypochondriasis (the "neurotic triad"). Some investigators have argued that it is this neuroticism that causes acute<unk>  to turn chronic, but clinical evidence points the other direction, to chronic<unk>  causing neuroticism. When long-term<unk>  is relieved by therapeutic intervention, scores on the neurotic triad and anxiety fall, often to normal levels. Self-esteem, often low in chronic<unk>  patients, also shows improvement once<unk>  has resolved.
symptom of Chest pain
symptom of Pericarditis
symptom of Mouth breathing
symptom of Air embolism
symptom of Hypoxia 
symptom of Lipedema
symptom of Constrictive pericarditis
symptom of Pulmonary embolism