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Hand cramps are a result of hand muscles and nerve condition. A  common cause of cramping is dehydration, heat exhaustion, fatigue,  and injury or trauma of nerves. This is â¦also common in people with  diabetes and to any condition that affects the nerves outside the  brain and spinal cord. David BÃ¤ckman.
I can only straighten them by using my other hand. A: What you describe sounds like carpal spasm. Spasms, or cramps, are involuntary muscle contractions. The most common causes of spasms are overused muscles (in the hands that might be due to writing or typing) and dehydration.Other causes of muscle cramping include low levels of calcium and magnesium.ome golfers experience contractions of the hand while putting, a phenomenon that's been nicknamed the yips.. Talk to your doctor if the cramps occur often. If he or she can't find a specific cause, focus on drinking enough water and stretching your fingers periodically.