What causes tingling in the hands and fingers?

Many causes. If both hands at once, can be hyperventilation (breathing too fast when anxious), low blood pressure, alcohol abuse, diabetes, and other nerve diseases (neuropathies). One sided symptoms can be a pinched nerve in neck, low blood flow into arm from thoracic outlet syndrome. Should be seen by doctor to sort out the cause if persisting.

Related Questions

What can cause numbness/tingling in my hands and fingers? It effects my head too, makes me feel a little cloudy. ;t gets better when I sit but standing it aggrevates, makes me feel weak...?

Many possibilities. There are quite a few possibilities for the symptoms you describe - from low blood pressure on standing (with many causes), to anxiety with hyperventilation, to a low calcium level, and peripheral neuropathy. Best to get checked out if this hasn't resolved on its own. Read more...
Many issues: BP? Med. There could be many causes but your blood pressure and medications come immediately to mind. You need a full examination by your primary care physician as well as a review of your history and medications along with possible diagnostic testing. Read more...

What can cause tingling in your forearm, hand and fingers? In between my thumb and index finger is some swelling to.

Neuritis. Nerve irritation either from your cervical spine or from the nerves of your forearm, hands and fingers. Duiabetes and electrolyte issues can also cause these issues: get examined and tested. Read more...
Several things. Need more information. Tingling in the 4th and 5th digit can be due to ulnar neuropathy in the base of the hand or elbow or c8 cervical nerve impingement. Tingling in the thumb through the 4 th digit may be due to carpal tunnel syndrome or a problem further upstream ( pronator syndrome, anterior interossius syndrome, ligament of struthers, plexopathy, thoracic outlet syndrome or C5-C7 issues. . Read more...

What may cause numbness and tingling on left hand and fingers?

See recent response. Someone asked same thing re r hand. Peripheral nerve compression (eg carpal tunnel) vs pinched nerve in neck vs other possible causes. Read more...