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Raynaud's syndrome
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== Causes == The cause of ''primary'' Raynaud's is unknown. It is more common and tends to be less severe than secondary Raynaud's. ''Secondary'' Raynaud's is caused by an underlying disease, condition, or other factor and is often called Raynaud's phenomenon.<ref name="raynauds">{{Cite web|url=https://www.nhlbi.nih.gov/health-topics/raynauds| title = Raynaud's {{!}} Health Topics | last = | first = | date = |language=en|archive-url=|archive-date=|url-status=|access-date=2022-01-04}}</ref> Possible causes are: * Diseases and conditions that directly damage the arteries or damage the nerves that control the arteries in the hands and feet * Repetitive actions that damage the nerves that control the arteries in the hands and feet, including [[carpal tunnel syndrome]] or [[repetitive strain injury]] * Injuries or surgeries to the hands or feet. * Exposure to certain chemicals * Medicines that narrow the arteries or affect blood pressure, eg. Certain medicines, those for [[migraine]]s, cancer, [[hypertension|high blood pressure]], birth control, and some over the counter cold or [[allergy]] medications.<ref name="raynauds" />
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