Hello, Numbness /tingling sensation or any type of altered sensation are the consequences of nerve impingement or involvement.
Do you have any associated pain/discomfort/heaviness at arm/forearm/hand/fingers? If yes then this is a nurological issue.
Site / location of nerve impingement must be diagnosed, nerve may impinge at cervical region ( slip disc) or at the level of elbow or wrist.
Do u have numbness at all fingers ? Or selected one ??
Next Steps
in case of slip disc you can use TENS at the site of discomfort and cervical root region.
consult with physiotherapists and you can also perform NTT/ neural tension test ( therapeutic neural tension ) at that limb.
neck isometric exercise.
Health Tips
don't carry heavy weight .
use right medium height pillow, proper posture guidelines during sitting / standing/ walking.
thanking you