I have raynauds too, It can be heraditary, my neice also has it. It is sometimes a sighn of cardiovasuclar problems, do those run in your family? Heart disease is my familys No#1 killer on both sides. Stress can also trigger an attack or frequency of them. Iv'e had my index finger turn dead white and numb while folding warm laundry on an 80 degree day so cold is definately not the only trigger. It can get worse. Mine has progressed over the years but I have not had a problem in a long time. My index fingers and pinky fingers do it sometimes and its so weird. snow white and knumb like theres not a drop of blood in there its really freaky and it hurts. try massage and warm water.