Why does my hand keep falling asleep?

Answer

According to Medline Plus, the causes of numb and tingling hands include sitting or standing in the same position for a long time, a lack of blood supply to the area, an injury to a nerve or even a reaction to seafood toxins. The hands may also keep falling asleep because of certain medications, animal bites or bites from insects, ticks, mites or spiders.

MedlinePlus also cites other potential causes of the hands falling asleep including radiation therapy and nerve damage due to alcohol, lead, tobacco and chemotherapy drugs. Shingles and herpes zoster infection may also cause the hands to fall asleep. The hands may also fall asleep due to a lack of vitamin B12 or another vitamin, as well as abnormal levels of calcium, potassium or sodium. Pressure on the nerves of the spine and on the peripheral nerves also may lead to the hands falling asleep. MedlinePlus also explains that the tingling and numbness in the hands may also come from other medical conditions that include carpal tunnel syndrome. Diabetics also experience the sensation of their hands falling asleep. Migraines, multiple sclerosis, seizures, stroke, transient ischemic attack, underactive thyroid and Raynaud's phenomenon all may lead to the hands falling asleep.

Reference:
Q&A Related to "Why does my hand keep falling asleep?"
It sounds as if you are having poor circulation , which lead to your hands not
http://www.chacha.com/question/why-do-my-hands-kee...
Likely one of two causes: median and/or ulnar nerve impingement. Median nerve supplies feeling to the thumb and first two fingers and is often irritated with excessive wrist motion.
http://www.quora.com/Why-does-my-hand-sometimes-fa...
Diabetic neuropathy is a disorder that affects the peripheral nerve. This typically occurs in people who have poor control over their blood sugar or those diagnosed with diabetes.
http://www.ehow.com/info_8778159_leg-fall-asleep-a...
Pregnant women are more likely to develop Carpal Tunnel Syndrome while pregnant. I am sure that is probably what it is. Do you work with your hands alot? Maybe you could get a wrist
http://answers.yahoo.com/question/index?qid=200904...
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