The question should be why is MY left hand always cold.
My left hand is never cold but my sisters is always.
The reasons could be:
No blood circulation
Body is on a low temp.
The place your in is cold
Or your just not moving your hand
Hope this helped!
SOURCES: MY SISTER
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This is not normal for a healthy person unless each hand is exposed to a different external temperature, such as a heat source or something cold.
For instance, if you hold a cold beverage in one hand and/or a warm sandwich in the other hand, your hands will most likely have different temperatures. This effect is completely reversible and is not a cause for concern unless either hand approaches temperatures that might damage your skin such as through burns or frostbite.
If it's just that one finger, you might be experiencing Raynaud's phenomenon. Next time it happens, snap a picture with your cell phone and show your health care provider.