Hi, thanks for your query on Healthcare Magic. I understand your concern. If tingling occurs in both hands (symmetrical) is usually accompanied also with tingling feet, mostly due to peripheral nerve damage or peripheral neuropathy. This is caused by systemic and non-local diseases or disorders (local = only one or part of the nerves involved). Conditions or diseases that cause this tingling include: 1. Diabetes. Diabetes with uncontrolled high blood sugar over time will cause damage to peripheral nerves characterized by tingling, numbness, and accomplice was cold. 2. Systemic disease. These include kidney disorders, liver disease, blood vessel damage and blood diseases, amyloidosis, connective tissue disorders and chronic inflammation, hormonal imbalance (including hypothyroidism), and cancer and benign tumors that affect the nerves. 3. Vitamin deficiency. Vitamins E, B1, B6, B12, and niacin are essential for healthy nervous function. B12 deficiency, for example, can cause pernicious anemia, an important cause of peripheral neuropathy. However, too much B6 can also cause tingling in the hands and feet. To determine the exact cause of the tingling hand, check with your doctor, in addition to anamnesis and physical examination may also require investigation, including blood checks, to detect diabetes, vitamin deficiency, liver and kidney function, other metabolic disorders and signs of abnormal immune system activity. Like the test that you ve done before, you may be referred to the hospital for further examination: 1. Cerebrospinal fluid examination. It can identify antibodies associated with peripheral neuropathy. 2. Examination of electromyogram (EMG), muscle electrical activity test Nerve conduction velocity (NCV) 3. Computed tomography (CT) 4. Magnetic resonance imaging (MRI) 5. Nerve biopsy 6. Skin biopsy to see the ends of nerve fibers. Hope this answer your question. Take care.