Tumor On Thumb I Have A Numbness In My Right Thumb, Is That A Sign Of A Tumor? I Also Have Extreme Pressure In My Head?

I have a numbness in my right thumb, is that a sign of a tumor? i also have extreme pressure in my head? - tumor on thumb

as soon as I lift my right arm, the thumb falls asleep, but when I get it to disappear. only repeat if I raise my arm. Suggestions? plz help!