Explain raynauds syndrome what it is and symptoms?

It is: It is a condition where your blood vessels in your extremities such as your hands and feet can clamp down when exposed to cold which turns those areas pale and purple and when the blood vessels return to normal they can turn red. It can be quite painful. There are several conditions associated with this.

Raynaud's: Raynaud's syndrome is a spasm of the small vessels of the hands most often related to cold weather, emotional stress, or a multitude of other factors. Classically it is described as cold hands which first turn "ghost white" and then become purplish in color, most often trigged by the cold. This usually gets better when the hands are warmed. At worst it can cause ulcerations of the fingers.