Pain in right hand fingers. Else?

My age 47, Weight 75, Male. Current medication - only Hypertension. I was having little pain and little numbness (मुंग्या येणे) in my right hand fingers only when I woke up in morning, I was feeling this issue for almost 2 months in Dec 2019 and Jan 2020. My weight was 90kg the then. Effective Feb    2020, I started having a proper diet and 1hr walking and lost 15kg weight and gradually such pain and numbness stopped. (I don't if there is any connection of this). But since a week I feel it's started again, mainly in morning and sometimes throughout day but very little pain or little numbness (मुंग्या येणे) in right hand fingers. (Intensity less than earlier). Based on the above, kindly advise what could be reason. Any vitamin deficiency issue or anything else? What kind of precautions i should take.