The most common cause of numbness of hands is carpel tunnel syndrome. This has been ruled out in your case as you have already consulted someone for it. The other common causes can be -
- systemic causes like diabetes or under active thyroid.
- It can be an imbalance of sodium, potassium - seen in cases of dehydration. If you are exercising in the evening and not taking enough salt and fluids after the exercise, then this might be the cause.
- Calcium deficiency - seen in cases of hypothyroidism.
- a simple Vitamin B12 deficiency.
- toxins like tobacco and alcohol.
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Regards
Dr. Gupta

