Oven gloves when handling frozen food.
Fingerless gloves really helps, funnily enough. The fingerless gloves that can be converted in to full gloves are good, this sort of thing
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Keep out of draughts, even warm air can trigger it such as car heaters and air con.
Wear gloves when holding cold drinks, or use an insulated beaker.
The doctor can prescribe drugs to improve circulation to the extremities, they help a lot of people but not everyone.