Raynaud Syndrome and Raynaud Phenomenon

What are the signs and symptoms of the condition?

Raynaud syndrome and Raynaud phenomenon may cause changes in skin color. Often, the skin pales or becomes bluish when arteries constrict. When the arteries relax, the skin may flush and redden before its color returns to normal. Some of the other symptoms are as follows:

In Raynaud syndrome, symptoms will be bilateral, or experienced on both sides of the body. In Raynaud phenomenon, symptoms generally affect only one side of the body, and usually affect only one or two digits. In both conditions, the thumb is rarely affected.