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Idiopathic environmental intolerances or Multiple chemical sensitivity (MCS) is a chronic medical condition and syndrome characterized by symptoms that the affected person attributes to low-level chemical exposures to commonly used chemicals. Commonly attributed substances include scented products, pesticides, plastics, synthetic fabrics, smoke, petroleum products, and paint fumes. Symptoms are subjective and vague. Symptoms are also non-specific, meaning that they are common symptoms, such as fatigue or headaches, that are present in hundreds of other illnesses. Commonly reported symptoms also include nausea, dizziness, and inflammation of skin, joints, gastrointestinal tract and airways. Although the symptoms themselves are real, and can be disabling, MCS is not recognized as an organic, chemical-caused illness by the World Health Organization, American Medical Association, and other organizations.〔〔 Blinded clinical trials have shown MCS patients react as often and as strongly to placebos as they do to chemical stimuli; the existence and severity of symptoms is related to perception that a chemical stimulus is present.〔 Depression, anxiety, somatoform disorder, and similar mental health conditions are commonly associated with reports of MCS.〔〔 == Signs and symptoms == Symptoms range in severity from mild to disabling. Symptoms are common, but vague and non-specific for the condition, the most common being feeling tired, "brain fog" (short-term memory problems, difficulty concentrating) and muscle pain. These complaints may be present with a wide variety of medical conditions, from psychiatric conditions, such as major depressive disorder, to neurological conditions, such as orthostatic intolerance, to sleep disorders, high blood pressure, autoimmune diseases and cancer. A partial list of other symptoms patients have attributed to MCS include: difficulty breathing, pains in the throat, chest, or abdominal region, asthma, skin irritation, contact dermatitis, hives or other forms of skin rash, headaches, neurological symptoms (nerve pain, pins and needles feelings, weakness, trembling, restless leg syndrome), tendonitis, seizures, visual disturbances (blurring, halo effect, inability to focus), extreme anxiety, panic and/or anger, sleep disturbance, suppression of immune system, digestive difficulties, nausea, indigestion/heartburn, vomiting, diarrhea, joint pains, vertigo/dizziness, abnormally acute sense of smell (hyperosmia), sensitivity to natural plant fragrance or natural pine terpenes, dry mouth, dry eyes, and an overactive bladder. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multiple chemical sensitivity」の詳細全文を読む スポンサード リンク
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