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What are hand cramps? Cramps in your hand can arise from a number of different causes. Hand cramps develop as a result of conditions affecting muscles and nerves in your hand. Trauma or injury to a nerve in your hand can also cause hand cramps. Even breathing too fast (hyperventilation) can result in hand cramps, as carbon dioxide levels in the blood become too low. Everyday, simple reasons, such as fatigue from overuse, can lead to temporary, acute cramps in the hand.
A narrowing of the arteries that deliver blood to the extremities -- such as the hands -- can produce cramping. Dehydration and vitamin D deficiency have both been linked to muscle cramping. Frequently, a repetitive motion during a daily activity -- such as typing -- can cause muscle cramps in the hands.