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Good morning, I am Dr Ruff, thank you for contacting us today
I am sorry to hear this. I am just reviewing the question.
So Raynauds is still the most likely cause. Cold hands implies reduced blood flow. Blood is warm, therefore in conditions such as raynaud's where the vessels can constrict due to over sensitivity, this can cause the hands to feel cold.
Severe symptoms include pain and tingling.
Therefore this is reassuring.
How old is your son please?
I Okay thanks. So this doesn't exclude Raynauds.
Given your sons age I would suggest getting him to referred to Paediatrics. He is young to have this, doesn't mean that it isn't Raynauds but there are some connective tissue problems that can cause it therefore may fall under Rheumatology.
The first stop would be Paediatrics. They are however likely to just observe this given it isn't causing any problem as such.
This is unlikely to be cardiac in cause, so no I do not think there is anything to worry about regarding the heart.
That is my pleasure, all the best.