Clinicians

Unknown etiology conditions
Conditions with unknown etiology, or idiopathic diseases, are diseases with an unknown cause or mechanism. Some examples of conditions with unknown etiology include:
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Myalgic Encephalomyelitis (ME)/Chronic Fatigue Syndrome (CFS)A complex illness that affects many people and can cause fatigue, musculoskeletal pain, sleep disturbances, headaches, and impaired concentration and short-term memory
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Fibromyalgia Syndrome (FMS)A condition with unknown etiology
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Villitis of unknown etiology (VUE)A placental condition that can occur when a mother's immune system loses its tolerance for her genetically unique fetus
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Chronic kidney disease of unknown etiology (CKDu)A global public health problem that may be caused by heat stress, agrochemicals, contaminated drinking water, or heavy metals