My 15 year old son's veins bulge in his arms and hands when his arms hang down but when he raises them up they return to normal - he has said this has been happening for some time but has only just told me about it so and has not seen a doctor about it. He is about to go away on a DofE weekend and I'm worried about it. He also gets poor circulation in his hands and feet when they are cold - they go a dark colour and feel numb - he mentioned this to a doctor some time ago who said it could be Raynaud's Phenomenon and wasn't serious.