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Your thumbs go numb because blood is having trouble circulating to your extremities.

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11y ago
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Wiki User

13y ago

Carpel tunnel or nerve damage will often cause this. Go see a doctor.

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10y ago

Biting it for a long time or sit on it for awhile.

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14y ago

if you tie a rubber band around them

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Q: What causes fingertips and legs to be numb?
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