When attacks of Raynaud's occur in the absence of other medical conditions, it is called Raynaud disease. When attacks occur as part of a disease (as in scleroderma), it is called Raynaud phenomenon.

Answer 2:

The phenomenon in which, a disorder causing discolouration of the fingers, toes, and occasionally nose and earlobes is discussed; is known as Raynaud's Phenomenon.

Raynaud's Disease, or "Primary Raynaud's", is diagnosed if the symptoms are idiopathic, that is, if they occur by themselves and not in association with other diseases.

Raynaud's Syndrome, also called as Raynaud's Secondary is the name for the condition when it is result of an underlying problem.

There are no known causes for Primary Raynaud's Disease, however, Secondary Raynaud's Disease is caused as a result of lupus, scleroderma, rheumatoid arthritis, or atherosclerosis. Other causes of secondary Raynaud's include taking certain medicines, using vibrating power tools for several years, smoking, or having frostbite. Please refer to the link below for full details of the Raynaud Phenomenon.