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Poor blood circulation: One of the most common causes is poor blood flow to the hands and feet. This can occur if you hold an uncomfortable position for long periods of time, such as sleeping on one arm or crossing your legs for hours.
Nerve copression: The nerves that run from the spine to the extremities can be compressed due to poor posture, injury, or conditions such as sciatica or carpal tunnel syndrome.
Nutritional deficiencies: A lack of essential vitamins, such as B12, can affect nerve function and cause tingling.