Bilat hand tingling. There are several causes. For example, hyperventialation or chemical/electrolyte abnormalities may be to blame. However, one must also search for central nervous system or spinal cord etiologies.
Nerve injury. In general, numbness and tingling is the sequelae of a nerve injury or a nerve compression. The most common cause of numbness and tingling is carpal tunnel syndrome, which represents nerve compression at the wrists. However, nerve compression can also occur in the neck, shoulders, elbows, and forearms. It is often necessary to under an "electrodiagnostic evaluation" to elucidate this further.