My left hand suddenly has gone numb fingers mostly I'm a 50 year old male

Hello Anon

Thank you for writing!

Hand numbness is usually caused by damage, irritation or compression of one of the nerves or a branch of one of the nerves in your arm and wrist. Diseases affecting the peripheral nerves, such as diabetes, also can cause numbness, although with diabetes similar symptoms usually occur first in your feet. If this continues, see your doctor.
Best,
Susan