Light Hand Numbness Numbness On Hand And Foot On One Side, When Moving Neck Around.?

Numbness on hand and foot on one side, when moving neck around.? - light hand numbness

My father, numbness of the left hand of the hand and foot, when you turn your head to the side (sorry, I can not remember whether left or right), but no numbness, so the other direction.

It is also the stunning still turn your head down, but right when he turns his head upwards

They feel the numbness can be a neck injury in childhood.
Can you light on this?

Thank you, very much appreciated.