What are the key factor's in knowing whether or not I have raynaud's disease?

Look for causes. When a patient has raynaud's phenomenon (vasospasm 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 "raynaud's disease". If an underlying condition is found, then the disorder is called "raynaud's syndrome".
Symptoms. Symptoms of cold fingers, toes, and sometimes tip of nose and ears--all on exposure to cold or emotional upsets-- are the typical symptoms.