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How long has this been going on?
Where exactly in the hand do you feel the numbness?
What you are experiencing is likely related to a herniated disc in the neck:
and this can cause pain to radiate down the arm to the hand.
The fact that this started with headache/neck pain also suggests the "pinched" nerve in the neck possibility here.
If you have considerable pain, or weakness -- MRI of the cervical spine would be ordered. Many people will start with antiinflammatory medications (ibuprofen, naproxen) for now, and see if this improves over the next couple of weeks.
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Yes, it can happen on either the right or left side. Sometime both at the same time.