What could cause a tingling in the fingers of my left hand that wont go away?

Maybe carpal tunnel. Pressure on the nerves at the level of the wrist, or higher up can cause these symptoms. Can be a repetitive stress injury from keyboards, etc. See your doc.
Nerve Impingement. Depending on which fingers are tingling, it could be different nerves which could be compressed anywhere from your shoulder/neck area to your wrist. We would need more details to give you more specific advice. Generally though, this could be due to sleeping in a restrictive position, typing on a computer all day, tight muscles, etc. Take note of anything you may be doing that triggers the tingling.

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