Related & different: When a patient has raynaud's phenomenon (the symptom of vasospasm leading to poor circulation in the fingers and toes), his doctors will look for the common causes such as autoimmune disorders, drug side effects, hormonal imbalances, etc... If no medical condition is found that is causing the symptoms, then the disorder is called "primary". If a condition is found, then the disorder is "secondary".
Answered 1/26/2018
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Yes: Most doctors use these terms interchangeably.
Answered 1/24/2016
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