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

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. .
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.

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Tingling feeling in left ring/middle/index fingers and thumb and it gets worse when I stretch my arm out what can this be

Sounds like you may. Be having a carpal tunnel syndrome in which the main nerve to the hand & fingers gets trapped in the wrist byr a thick ligament. It affects all the fingers towards the thumb and generally half of the ring finger. Presents with tingling/numbness early on, usually at night, as it's getting worse, pain/weakness starts with dropping things. Initially splint & later surgery to release it, helps. Read more...

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Cervical pressure. This could be related to pressure on your cervical vertebrae , if the nerve is under pressure it could send numbing sensation into your arms and fingers, it is affecting you r side. You need to see an orthopedic surgeon and get it diagnosed properly. Hope you get better. Read more...